This document summarizes key aspects of forensic ballistics including:
1. Ballistics is the study of firearms, ammunition, and their effects. Forensic ballistics deals with investigating firearms/ammunition and the injuries/medico-legal issues they cause.
2. Ballistics is divided into internal, external, terminal, and wound ballistics. Internal ballistics examines what happens inside the firearm during discharge. External ballistics examines what happens after discharge until impact. Terminal and wound ballistics study the projectile's motion upon impact and the resulting injuries.
3. Key parts of firearms include the chamber, barrel, magazine, and types. Rifled firearms have grooves cut into the barrel to
This document discusses firearm injuries and ballistics. It defines key terms like firearms, ammunition, cartridges, and ballistics. It describes the parts of firearms like barrels and breech parts. It explains characteristics of different types of firearms like smooth bored guns, rifled guns, revolvers, pistols, and shotguns. It also discusses cartridges, gunpowders, primers, and projectiles. Finally, it describes characteristics of injuries caused by different firearms and their medico-legal aspects.
Firearm injuries can be analyzed based on wound characteristics to determine details like the type of firearm, firing range, and manner of injury. Entry wounds are usually smaller and have inverted edges while exit wounds are larger with everted edges. Tattooing and soot deposition can indicate a close firing range. The presence of an abrasion collar or lead residue in wounds and on the hand helps determine if the person recently fired a gun. Analyzing the bullet, wound ballistics, and performing dermal nitrate tests on the hand are important for the medico-legal investigation of firearm-related deaths.
This document discusses firearm injuries and terminology related to forensic medicine. It describes different types of firearms including shotguns and rifled weapons. Shotguns fire multiple pellets while rifled weapons fire a single projectile. The document details the mechanisms of injury from firearms, characteristics of entrance and exit wounds, factors to consider when determining if a firearm injury was from accident, suicide or homicide, and the duties of doctors in cases of firearm injuries and deaths.
1. A firearm discharges a missile using expanding gases from combustion in a closed space. It consists of a barrel, action, and grip.
2. Rifling imparts spin to bullets for stability and accuracy. Rifled weapons include handguns like pistols and revolvers, as well as rifles. Shotguns have smooth bores.
3. Cartridges contain propellant, primer, casing, and a bullet or shots. Propellant burns to produce gases that accelerate the projectile down the barrel.
This document discusses various types of mechanical injuries including abrasions, contusions, lacerations, and their distinguishing features. It defines abrasions as denudation of superficial skin layers caused by friction against a rough surface. Contusions are characterized by extravasation of blood into subcutaneous tissue due to blunt force trauma. Lacerations are tears or splits of skin/tissue caused by blunt force stretching tissues beyond their limits. The document outlines the classification, appearance, healing process, differential diagnosis and medicolegal importance of each type of mechanical injury.
This document discusses various types of mechanical or physical injuries caused by blunt force, including abrasions, contusions, lacerations, and bruises. It provides classifications of injuries including based on causative factor (blunt force, sharp force, firearms, thermal, chemical), severity (simple, grievous, dangerous), and time of infliction (antemortem, postmortem, perimortem). Details are given on features, appearances, complications and medicolegal importance of specific injuries like abrasions, contusions, lacerations, and factors that affect bruise formation. The document also discusses concepts like patterned injuries, migratory bruises, and differences between ante- and postmortem injuries.
This document discusses wound ballistics of rifled firearms. It begins by introducing forensic ballistics and the different types: internal, external, and terminal ballistics. It then discusses wound ballistics, focusing on the mechanism of injury when a projectile strikes a living target. Key factors that influence the transfer of kinetic energy are explored. Different types of gunshot wounds are defined, including penetrating, perforating, and wounds that are both penetrating and perforating. Cavitation effects and characteristics of entry and exit wounds are also summarized.
This document discusses firearm injuries and ballistics. It defines key terms like firearms, ammunition, cartridges, and ballistics. It describes the parts of firearms like barrels and breech parts. It explains characteristics of different types of firearms like smooth bored guns, rifled guns, revolvers, pistols, and shotguns. It also discusses cartridges, gunpowders, primers, and projectiles. Finally, it describes characteristics of injuries caused by different firearms and their medico-legal aspects.
Firearm injuries can be analyzed based on wound characteristics to determine details like the type of firearm, firing range, and manner of injury. Entry wounds are usually smaller and have inverted edges while exit wounds are larger with everted edges. Tattooing and soot deposition can indicate a close firing range. The presence of an abrasion collar or lead residue in wounds and on the hand helps determine if the person recently fired a gun. Analyzing the bullet, wound ballistics, and performing dermal nitrate tests on the hand are important for the medico-legal investigation of firearm-related deaths.
This document discusses firearm injuries and terminology related to forensic medicine. It describes different types of firearms including shotguns and rifled weapons. Shotguns fire multiple pellets while rifled weapons fire a single projectile. The document details the mechanisms of injury from firearms, characteristics of entrance and exit wounds, factors to consider when determining if a firearm injury was from accident, suicide or homicide, and the duties of doctors in cases of firearm injuries and deaths.
1. A firearm discharges a missile using expanding gases from combustion in a closed space. It consists of a barrel, action, and grip.
2. Rifling imparts spin to bullets for stability and accuracy. Rifled weapons include handguns like pistols and revolvers, as well as rifles. Shotguns have smooth bores.
3. Cartridges contain propellant, primer, casing, and a bullet or shots. Propellant burns to produce gases that accelerate the projectile down the barrel.
This document discusses various types of mechanical injuries including abrasions, contusions, lacerations, and their distinguishing features. It defines abrasions as denudation of superficial skin layers caused by friction against a rough surface. Contusions are characterized by extravasation of blood into subcutaneous tissue due to blunt force trauma. Lacerations are tears or splits of skin/tissue caused by blunt force stretching tissues beyond their limits. The document outlines the classification, appearance, healing process, differential diagnosis and medicolegal importance of each type of mechanical injury.
This document discusses various types of mechanical or physical injuries caused by blunt force, including abrasions, contusions, lacerations, and bruises. It provides classifications of injuries including based on causative factor (blunt force, sharp force, firearms, thermal, chemical), severity (simple, grievous, dangerous), and time of infliction (antemortem, postmortem, perimortem). Details are given on features, appearances, complications and medicolegal importance of specific injuries like abrasions, contusions, lacerations, and factors that affect bruise formation. The document also discusses concepts like patterned injuries, migratory bruises, and differences between ante- and postmortem injuries.
This document discusses wound ballistics of rifled firearms. It begins by introducing forensic ballistics and the different types: internal, external, and terminal ballistics. It then discusses wound ballistics, focusing on the mechanism of injury when a projectile strikes a living target. Key factors that influence the transfer of kinetic energy are explored. Different types of gunshot wounds are defined, including penetrating, perforating, and wounds that are both penetrating and perforating. Cavitation effects and characteristics of entry and exit wounds are also summarized.
This document discusses firearm injuries and terminology related to forensic medicine. It describes different types of firearms including shotguns and rifled weapons like pistols, revolvers, and rifles. Shotguns fire multiple pellets while rifled weapons fire single projectiles with grooved barrels. The document details entrance and exit wound characteristics for different firearm ranges from contact wounds to long range injuries. It also discusses factors that can indicate accidents, suicides, or homicides based on wound location and patterns. Doctors have a duty to preserve any foreign materials from wounds and skin samples for potential forensic testing.
At the end of the session, you will be able to:
Define forensic ballistics and firearms
Understand different types of firearms and ammunition
Differentiate features of entry and exit wounds in firearms
Enlist Medico-legal aspects
It is useful for identification of the type of firearm, ammunition, and range i.e. the distance of the target from the muzzle end of the barrel of the firearm.
This document summarizes a seminar on post-mortem changes given by Dr. Nikhil Bansal. It discusses the definition of death and the different types of death, including somatic and cellular/molecular death. It outlines the signs of death that present immediately or at the molecular level. It provides a table describing the relationship between time since death and the condition of the body. It also summarizes the early signs of death, including rigor mortis and cadaveric spasm. Finally, it outlines the late signs of putrefaction, adipocere formation, and mummification.
The document discusses different types of wounds including bruises, abrasions, lacerations, and cuts. It describes the mechanisms of injury, appearances, distinguishing features, and forensic importance of each wound type. Bruises are caused by blunt force and appear as discoloration under the skin. Abrasions involve scraping off the outer layer of skin. Lacerations are tears in the skin or underlying tissues caused by shearing or stretching forces. Cuts are deep, penetrating injuries made by a sharp, bladed object. The document provides detailed information on wound analysis for medical-legal investigations.
Head injuries can occur from traffic accidents, assaults, or falls. They range from simple injuries with no brain involvement to serious injuries affecting the brain. Key types include closed head injuries where the dura remains intact and open head injuries where it is lacerated. Injuries can involve the scalp, skull, or brain. Scalp injuries include bruising, lacerations, and infections. Skull fractures vary in severity from hairline fractures to depressed fractures. Brain injuries include concussions, contusions, lacerations, and hemorrhages like epidural, subdural, subarachnoid, or intracerebral hemorrhages. Coup injuries occur under the impact site while contre coup injuries are on
Mechanical injuries caused by sharp cutting weapons like knives can be classified as incised wounds, chop wounds, or stab wounds based on the action used. Incised wounds are caused when an object is drawn across the skin, producing a clean cut. Chop wounds result from a heavy blunt force weapon and are typically deep and gaping. Stab wounds occur when a narrow pointed object is thrust into the body, leaving a small, puncture-like entry wound. The shape, size, depth, and direction of the wound can provide clues to the weapon used and the events that caused the injury. Careful examination of wounds and potential weapons is important for medicolegal investigations.
Ricochet refers to a bullet deflecting off a hard surface rather than penetrating it. Many factors influence ricochet behavior, including bullet shape, material, velocity, spin, target material, and angle of incidence. High velocity rifle bullets have a greater chance of penetrating rather than ricocheting. Elongated rifle bullets have higher sectional density than handgun bullets, influencing penetration. Harder target materials like bone are more likely to cause ricochet. The angle of ricochet is difficult to predict due to bullet deformation. Ricochets can cause unintended damage and be lethal if the bullet or fragments strike a person. Wounds from ricocheting bullets will have ragged, irregular edges. Ricoche
The document discusses mechanical injuries and traumatology. It defines important terms like trauma, injury, wounds, and classifications of injuries based on the weapon used, mechanics of infliction, and time of infliction. It also covers the mechanism of wound production, factors affecting wound appearance, and methods of determining the timing of wounds including naked eye appearance, histological timing by examining wound healing stages, histochemical timing by studying enzyme activity, and biochemical timing by measuring substances like histamine and serotonin.
Firearms can cause injuries through their components. A firearm discharges a projectile such as a bullet or pellets. The components that produce injury are the gun flame, smoke, unburnt gunpowder particles, cards, and wads. The speed and shape of the projectile along with the density and vitality of the target also influence the extent of injuries. Gunshot wounds vary based on the distance between the firearm and target, ranging from contact wounds with scorching and tattooing to distant wounds without these effects. Exit wounds are generally larger than entry wounds and have everted edges.
This document discusses stab wounds and chop wounds from a forensic perspective. It describes the characteristics of stab wounds including features of the entry and exit wounds. Stab wounds can be penetrating when the weapon remains in the body, or perforating when it passes through. The shape of the entry wound provides clues about the weapon used. Chop wounds are deep gaping wounds caused by heavy sharp weapons and will have gapping at the wound margins. Defensive wounds on the victim may also be present in homicidal cases involving stabbing or chopping.
This document provides information about tattoos, including their history, types, techniques, and forensic importance. It notes that tattoos have been practiced since ancient times, with the first known tattoo dating back 4,000 BC. It describes different types like traumatic, amateur, professional, cosmetic, and medical tattoos. Techniques for applying tattoos as well as removing them are outlined. Tattoos can be forensically important for identifying individuals or providing clues about religion, culture, criminal affiliations, and medical conditions. A case example is given where a tattoo helped identify a victim's severed arm found inside a shark.
Bullets come in a variety of shapes, constructions, and materials depending on their intended application. They can be categorized based on their manufacturing process or shape. In terms of manufacturing, bullets include unjacketted bullets made of hardened lead, jacketed bullets with a metallic jacket enclosing a lead core, wire-patched bullets with a copper wire envelope, and paper-patched bullets formerly made with paper jackets. They also include armor-piercing, tracer, and incendiary bullets. Bullets are further distinguished by their shape, such as hollow-point, sharp nose, round nose, boat-tailed, and split-nose bullets. The type of bullet chosen depends on the gun used and its intended range.
The document discusses cartridges and their components. A cartridge contains a bullet, propellant, and primer packaged in a metallic case. It summarizes that a cartridge has four main parts: the cartridge case, propellant, projectile, and sometimes wads. The cartridge case contains the primer and holds the contents. Propellant, usually smokeless powder, propels the projectile. Projectiles can be single bullets or multiple pellets/shots. When the trigger is pulled, the firing pin strikes the primer, igniting the propellant and forcing the projectile out of the barrel with substantial velocity.
Forensic medicine firearms and firearm injuriesMBBS IMS MSU
Firearms can be classified as either smooth-bore or rifled-bore weapons. Smooth-bore weapons like shotguns fire multiple projectiles at once, while rifled weapons like pistols and rifles fire a single bullet. Entry wounds vary based on the firearm caliber and distance, from contact wounds with scorching and blackening at close range to split entry holes at a more distant range. Exit wounds show a torn hole dependent on the bullet's momentum and any bone fragments carried with it, and the entry wound may be larger than the exit wound at close range. Forensic analysis of gunshot wounds can help reconstruct shooting incidents and determine factors like self-infliction, range, direction, and whether a particular weapon
This document discusses different types of injuries from a forensic science perspective. It defines medical and legal definitions of injuries. It then discusses classifications of injuries according to causative factors like abrasions, bruises, and lacerations. It describes features of abrasions and bruises, and how their appearance changes over time. It covers distinguishing ante-mortem and post-mortem abrasions. The medicolegal importance of patterned injuries in connecting victims to weapons or objects is also summarized.
1) Ballistics is the study of the motion of projectiles after being fired from a firearm. It includes exterior, interior, and terminal ballistics.
2) A firearm uses expanding gases from combustion of a propellant to propel a projectile out of the barrel. Firearms can be classified based on factors like intended use, barrel length, rifling, and firing mechanism.
3) In forensic investigations of firearm injuries, medical examiners seek to determine details of the shooting like the type of weapon, distance, number of shots, direction of fire, and whether injury was self-inflicted. Analysis of wound characteristics helps answer these questions.
This document summarizes key information about gunshot wounds, including:
1. Gunshots can produce entry and exit wounds. Entry wounds show characteristics from gases, flames, and particles exiting the muzzle, while exit wounds lack these features.
2. The appearance of entry wounds depends on factors like weapon type, ammunition, striking velocity, and distance from the muzzle. Close-range shots exhibit burning, tattooing, and other effects not seen at longer ranges.
3. Rifle and shotgun wounds present differently. Rifles produce single entry holes while shotguns can cause a "rat-hole" wound from multiple pellets merging at close range.
4. Exit wounds are often larger, more
This document discusses cessation of life and determining death. It covers:
- Definitions of somatic death, molecular death, brain death, and brain stem death.
- Criteria for determining whole brain death which requires absent brain and brainstem function and apnea.
- Importance of determining the cause and time of death for organ transplantation. Different organs remain viable for varying lengths of time after circulation stops.
- Distinctions between brain death, persistent vegetative state, and brainstem injury and how each affects respiratory and cardiac function.
This document discusses key concepts in ballistics and firearms. It defines ballistics as the science of motion of projectiles and describes its three components: internal, external, and terminal ballistics. It then classifies firearms into smooth bored and grooved firearms like shotguns, rifles, revolvers, and pistols. Key terms are defined such as caliber, velocity, range, rifling, choking, and their purposes and effects are explained. Important parts of firearms like the barrel, firing pin, hammer, trigger, and magazine are also outlined.
This document discusses different types of cartridges used in firearms. It describes the components of shotgun and rifle cartridges, including the case, primer, gunpowder, wads, and bullets. It explains the mechanisms of how cartridges are discharged from firearms and the characteristics of firearm injuries. It also covers factors that affect wound shape, estimation of firing distance, and the medico-legal importance of examining firearm wounds.
This document discusses medico-legal examination of firearms injuries. It covers the basics of ballistics, classifications of firearms, firearm wounds, and characteristics of wounds from different firearms. Key points include the four categories of ballistics (internal, external, terminal, wound), types of firearms and ammunition, features that distinguish entrance and exit wounds, effects of shotguns and rifles at different ranges, and medico-legal aspects of examining firearms injuries.
This document discusses firearm injuries and terminology related to forensic medicine. It describes different types of firearms including shotguns and rifled weapons like pistols, revolvers, and rifles. Shotguns fire multiple pellets while rifled weapons fire single projectiles with grooved barrels. The document details entrance and exit wound characteristics for different firearm ranges from contact wounds to long range injuries. It also discusses factors that can indicate accidents, suicides, or homicides based on wound location and patterns. Doctors have a duty to preserve any foreign materials from wounds and skin samples for potential forensic testing.
At the end of the session, you will be able to:
Define forensic ballistics and firearms
Understand different types of firearms and ammunition
Differentiate features of entry and exit wounds in firearms
Enlist Medico-legal aspects
It is useful for identification of the type of firearm, ammunition, and range i.e. the distance of the target from the muzzle end of the barrel of the firearm.
This document summarizes a seminar on post-mortem changes given by Dr. Nikhil Bansal. It discusses the definition of death and the different types of death, including somatic and cellular/molecular death. It outlines the signs of death that present immediately or at the molecular level. It provides a table describing the relationship between time since death and the condition of the body. It also summarizes the early signs of death, including rigor mortis and cadaveric spasm. Finally, it outlines the late signs of putrefaction, adipocere formation, and mummification.
The document discusses different types of wounds including bruises, abrasions, lacerations, and cuts. It describes the mechanisms of injury, appearances, distinguishing features, and forensic importance of each wound type. Bruises are caused by blunt force and appear as discoloration under the skin. Abrasions involve scraping off the outer layer of skin. Lacerations are tears in the skin or underlying tissues caused by shearing or stretching forces. Cuts are deep, penetrating injuries made by a sharp, bladed object. The document provides detailed information on wound analysis for medical-legal investigations.
Head injuries can occur from traffic accidents, assaults, or falls. They range from simple injuries with no brain involvement to serious injuries affecting the brain. Key types include closed head injuries where the dura remains intact and open head injuries where it is lacerated. Injuries can involve the scalp, skull, or brain. Scalp injuries include bruising, lacerations, and infections. Skull fractures vary in severity from hairline fractures to depressed fractures. Brain injuries include concussions, contusions, lacerations, and hemorrhages like epidural, subdural, subarachnoid, or intracerebral hemorrhages. Coup injuries occur under the impact site while contre coup injuries are on
Mechanical injuries caused by sharp cutting weapons like knives can be classified as incised wounds, chop wounds, or stab wounds based on the action used. Incised wounds are caused when an object is drawn across the skin, producing a clean cut. Chop wounds result from a heavy blunt force weapon and are typically deep and gaping. Stab wounds occur when a narrow pointed object is thrust into the body, leaving a small, puncture-like entry wound. The shape, size, depth, and direction of the wound can provide clues to the weapon used and the events that caused the injury. Careful examination of wounds and potential weapons is important for medicolegal investigations.
Ricochet refers to a bullet deflecting off a hard surface rather than penetrating it. Many factors influence ricochet behavior, including bullet shape, material, velocity, spin, target material, and angle of incidence. High velocity rifle bullets have a greater chance of penetrating rather than ricocheting. Elongated rifle bullets have higher sectional density than handgun bullets, influencing penetration. Harder target materials like bone are more likely to cause ricochet. The angle of ricochet is difficult to predict due to bullet deformation. Ricochets can cause unintended damage and be lethal if the bullet or fragments strike a person. Wounds from ricocheting bullets will have ragged, irregular edges. Ricoche
The document discusses mechanical injuries and traumatology. It defines important terms like trauma, injury, wounds, and classifications of injuries based on the weapon used, mechanics of infliction, and time of infliction. It also covers the mechanism of wound production, factors affecting wound appearance, and methods of determining the timing of wounds including naked eye appearance, histological timing by examining wound healing stages, histochemical timing by studying enzyme activity, and biochemical timing by measuring substances like histamine and serotonin.
Firearms can cause injuries through their components. A firearm discharges a projectile such as a bullet or pellets. The components that produce injury are the gun flame, smoke, unburnt gunpowder particles, cards, and wads. The speed and shape of the projectile along with the density and vitality of the target also influence the extent of injuries. Gunshot wounds vary based on the distance between the firearm and target, ranging from contact wounds with scorching and tattooing to distant wounds without these effects. Exit wounds are generally larger than entry wounds and have everted edges.
This document discusses stab wounds and chop wounds from a forensic perspective. It describes the characteristics of stab wounds including features of the entry and exit wounds. Stab wounds can be penetrating when the weapon remains in the body, or perforating when it passes through. The shape of the entry wound provides clues about the weapon used. Chop wounds are deep gaping wounds caused by heavy sharp weapons and will have gapping at the wound margins. Defensive wounds on the victim may also be present in homicidal cases involving stabbing or chopping.
This document provides information about tattoos, including their history, types, techniques, and forensic importance. It notes that tattoos have been practiced since ancient times, with the first known tattoo dating back 4,000 BC. It describes different types like traumatic, amateur, professional, cosmetic, and medical tattoos. Techniques for applying tattoos as well as removing them are outlined. Tattoos can be forensically important for identifying individuals or providing clues about religion, culture, criminal affiliations, and medical conditions. A case example is given where a tattoo helped identify a victim's severed arm found inside a shark.
Bullets come in a variety of shapes, constructions, and materials depending on their intended application. They can be categorized based on their manufacturing process or shape. In terms of manufacturing, bullets include unjacketted bullets made of hardened lead, jacketed bullets with a metallic jacket enclosing a lead core, wire-patched bullets with a copper wire envelope, and paper-patched bullets formerly made with paper jackets. They also include armor-piercing, tracer, and incendiary bullets. Bullets are further distinguished by their shape, such as hollow-point, sharp nose, round nose, boat-tailed, and split-nose bullets. The type of bullet chosen depends on the gun used and its intended range.
The document discusses cartridges and their components. A cartridge contains a bullet, propellant, and primer packaged in a metallic case. It summarizes that a cartridge has four main parts: the cartridge case, propellant, projectile, and sometimes wads. The cartridge case contains the primer and holds the contents. Propellant, usually smokeless powder, propels the projectile. Projectiles can be single bullets or multiple pellets/shots. When the trigger is pulled, the firing pin strikes the primer, igniting the propellant and forcing the projectile out of the barrel with substantial velocity.
Forensic medicine firearms and firearm injuriesMBBS IMS MSU
Firearms can be classified as either smooth-bore or rifled-bore weapons. Smooth-bore weapons like shotguns fire multiple projectiles at once, while rifled weapons like pistols and rifles fire a single bullet. Entry wounds vary based on the firearm caliber and distance, from contact wounds with scorching and blackening at close range to split entry holes at a more distant range. Exit wounds show a torn hole dependent on the bullet's momentum and any bone fragments carried with it, and the entry wound may be larger than the exit wound at close range. Forensic analysis of gunshot wounds can help reconstruct shooting incidents and determine factors like self-infliction, range, direction, and whether a particular weapon
This document discusses different types of injuries from a forensic science perspective. It defines medical and legal definitions of injuries. It then discusses classifications of injuries according to causative factors like abrasions, bruises, and lacerations. It describes features of abrasions and bruises, and how their appearance changes over time. It covers distinguishing ante-mortem and post-mortem abrasions. The medicolegal importance of patterned injuries in connecting victims to weapons or objects is also summarized.
1) Ballistics is the study of the motion of projectiles after being fired from a firearm. It includes exterior, interior, and terminal ballistics.
2) A firearm uses expanding gases from combustion of a propellant to propel a projectile out of the barrel. Firearms can be classified based on factors like intended use, barrel length, rifling, and firing mechanism.
3) In forensic investigations of firearm injuries, medical examiners seek to determine details of the shooting like the type of weapon, distance, number of shots, direction of fire, and whether injury was self-inflicted. Analysis of wound characteristics helps answer these questions.
This document summarizes key information about gunshot wounds, including:
1. Gunshots can produce entry and exit wounds. Entry wounds show characteristics from gases, flames, and particles exiting the muzzle, while exit wounds lack these features.
2. The appearance of entry wounds depends on factors like weapon type, ammunition, striking velocity, and distance from the muzzle. Close-range shots exhibit burning, tattooing, and other effects not seen at longer ranges.
3. Rifle and shotgun wounds present differently. Rifles produce single entry holes while shotguns can cause a "rat-hole" wound from multiple pellets merging at close range.
4. Exit wounds are often larger, more
This document discusses cessation of life and determining death. It covers:
- Definitions of somatic death, molecular death, brain death, and brain stem death.
- Criteria for determining whole brain death which requires absent brain and brainstem function and apnea.
- Importance of determining the cause and time of death for organ transplantation. Different organs remain viable for varying lengths of time after circulation stops.
- Distinctions between brain death, persistent vegetative state, and brainstem injury and how each affects respiratory and cardiac function.
This document discusses key concepts in ballistics and firearms. It defines ballistics as the science of motion of projectiles and describes its three components: internal, external, and terminal ballistics. It then classifies firearms into smooth bored and grooved firearms like shotguns, rifles, revolvers, and pistols. Key terms are defined such as caliber, velocity, range, rifling, choking, and their purposes and effects are explained. Important parts of firearms like the barrel, firing pin, hammer, trigger, and magazine are also outlined.
This document discusses different types of cartridges used in firearms. It describes the components of shotgun and rifle cartridges, including the case, primer, gunpowder, wads, and bullets. It explains the mechanisms of how cartridges are discharged from firearms and the characteristics of firearm injuries. It also covers factors that affect wound shape, estimation of firing distance, and the medico-legal importance of examining firearm wounds.
This document discusses medico-legal examination of firearms injuries. It covers the basics of ballistics, classifications of firearms, firearm wounds, and characteristics of wounds from different firearms. Key points include the four categories of ballistics (internal, external, terminal, wound), types of firearms and ammunition, features that distinguish entrance and exit wounds, effects of shotguns and rifles at different ranges, and medico-legal aspects of examining firearms injuries.
This document discusses forensic ballistics and firearm wounds. It begins by defining forensic ballistics as the science dealing with the investigation of firearms, ammunition, and problems arising from their use. It then discusses different types of firearms and ammunition like rifles, pistols, shotguns. It explains the different types of firearm wounds based on factors like distance, ammunition used. It details the characteristics of entry and exit wounds and how they differ. It concludes by listing some medico-legal aspects examined in firearm injuries like the type of weapon used, direction and range of fire.
Dr. Elias Bin Akber's Forensic Medicine PresentationFaisal Bin Akber
This document provides information on firearm injuries and related topics. It defines firearms and describes their classification based on bore. It also defines key related terms like bullets, pellets, rifling, choking, primers, gunpowder and their importance. The document discusses characteristics of gunshot wounds, differences between entry and exit wounds, and differences between suicidal and homicidal gunshot wounds. It also describes test procedures like dermal nitrate test and special bullet types.
1. Firearms analysis examines guns, bullets, and cartridge casings to determine if a specific gun was used in a crime. Microscopic marks left on bullets and casings when fired provide unique "fingerprints" that can identify the weapon used.
2. Gun barrels leave distinct striation marks on bullets that pass through them. Comparing test-fired bullets to evidence bullets under a microscope can match bullets to the firearm from which they were fired.
3. Other toolmarks left on cartridge casings, such as firing pin impressions and ejector marks, also provide identifying patterns that link spent casings to a particular firearm. The combination of these factors allows forensic experts to determine if a gun was used in
A contact shot from a rifled weapon results in a triangular, stellate, or cruciate wound with everted edges due to blowback. There is no scorching, blackening, or tattooing, and tissues may appear cherry pink due to carbon monoxide. A muzzle imprint may be visible. Close shots within 3 inches result in a circular wound with inverted edges and scorching, blackening, tattooing, and an abrasion collar from the spinning bullet. Grease from the bullet also causes a grease collar. Near shots from 1-3 feet produce similar effects but without scorching. Distant shots over 3 feet result in a circular wound with inverted edges and internal grease and abrasion
Oscar Pistorius, a Paralympic athlete, shot and killed his girlfriend Reeva Steenkamp in February 2013. He claimed he mistook her for an intruder. A case of premeditated murder was opened against him. At his trial in 2014, forensic evidence and witness testimony was presented. Pistorius was ultimately found guilty of culpable homicide but acquitted of murder.
This document provides information on gunshot wounds and firearm identification. It discusses different types of gunshot wounds like souvenir bullets, bullet migration, and tandem bullets. It also describes how to document a gunshot wound and the information needed in court. Further, it discusses analyzing gunshot residue on skin and clothing. Finally, it outlines how to identify a firearm through factors like caliber, fingerprints, barrel fouling, serial number, and ballistics examination of marks left on bullets and cartridge cases.
Firearms identification experts can identify key details about firearms from ballistic evidence:
- Rifling marks on bullets can identify the specific gun used due to variations between firearms.
- Firing pin and breechblock markings on cartridge casings are also unique to each gun.
- The type of bullet, firearm, and presence of gunshot residue can provide important clues during investigations.
We saw the infamous 26/11 at Mumbai, India. We lost some brave-hearts. Hence, we look into the forensics behind firearm injuries. We shall also discuss the JFK assassination case in brief. I would recommend downloading the presentation and view it in power point 2010 or above to see all the effects flawlessly.
This document summarizes key information about barrel manufacture and bullet and cartridge identification. It describes how rifling in gun barrels imparts spin to bullets, improving range and accuracy. It also details how bullets deform to seal in gases and obturate in the barrel. Furthermore, it outlines unique characteristics of gun barrels that can identify them like lands and grooves diameter, depth and twist rate. The document concludes by explaining how fired bullets and cartridge cases can be identified by marks from the gun like striations, firing pin, breech and ejector marks.
The document discusses the history and development of gunpowder, firearms, bullets, and ballistics technology from ancient China to the 19th century. It describes how gunpowder was refined for use in firearms and the development of matchlock, wheel lock, flintlock, and percussion cap firing mechanisms. It also discusses the introduction of rifling in gun barrels and how this improved accuracy. Finally, it summarizes different bullet types, construction methods, and how ballistics analysis can identify class and individual characteristics of firearms and bullets.
This document discusses the examination process for firearm evidence. It explains that firearms evidence is examined when a weapon has been discharged at a crime scene. Examiners can identify or eliminate firearms as being involved through comparison of cartridge cases, bullets, or the firearm itself if available. Tests are conducted by discharging ammunition through the firearm and recovering test bullets and cartridge cases to compare with evidence. Multiple techniques are used in the comparison process like stereomicroscopy, comparison microscopy, and scanning electron microscopy. The document also provides details on unique issues with examining homemade or improvised firearms.
1. Terminal ballistics deals with the behavior and effects of projectiles when they impact targets and transfer energy. It studies penetration potential and wound ballistics.
2. When a projectile strikes the body, it compresses tissues until they tear beyond their elastic limits if the projectile has enough energy. It continues through an exit wound, causing internal damage.
3. Factors affecting wounding include the target site, velocity, projectile construction, and range. Frontal wounds cause more damage due to shallow tissue depth. Higher velocities increase energy and damage.
Internal ballistics refers to the science of what occurs inside a firearm from ignition until the projectile exits the barrel. It involves three phases: lock time, ignition time, and barrel time. Factors that influence internal ballistics include propellant type and burn rate, bore size, bullet size, loading density, chamber pressure, and barrel length. Understanding internal ballistics helps maximize a firearm's accuracy, range, rate of fire, and damage potential.
This document provides an introduction to firearms, including the basic parts and types of firearms like rifles, shotguns, pistols and revolvers. It covers safety rules, ammunition, how firearms operate, cleaning procedures and key terminology. The presentation is divided into multiple sections on topics such as actions, sights, safeties, gauges and chokes. It emphasizes safe and responsible firearm handling.
The document discusses the design and manufacturing process of gladius swords. It provides several key points:
1) Gladius swords were designed to be very strong and durable weapons that would serve their purpose if needed by the hero wielding them.
2) Modern historians are biased in their analyses based on what artifacts have survived, rather than considering that most swords produced were likely ordinary quality given the high costs of expert craftsmanship.
3) Swords have a round cross-section because hammering out the metal from an ingot naturally curves it as the material thins, in addition to a round shape producing a sharper blade.
This document discusses various topics related to forensic psychiatry including:
1. Types of delusions such as delusions of persecution, grandeur, and infidelity.
2. Types of hallucinations including visual, auditory, olfactory, tactile, and psychomotor hallucinations.
3. Legal tests for insanity such as the M'Naghten rule, which states that to use insanity as a criminal defense, the accused must not have known the nature or quality of their actions, or that they were wrong, due to mental illness.
4. Responsibility and restraint considerations for the mentally ill, including admission criteria and limitations on certain treatments without proper approval.
This document provides information about examining a survivor of sexual assault. It defines rape under Indian law and discusses consent. It also discusses the Protection of Children from Sexual Offences Act and defines sexual offenses against children. The document outlines what should be included in a sexual assault forensic examination kit and the process for examining a survivor, including taking a detailed history, consent procedures, documentation, sample collection, and police notification when required by law. The goal is to provide medical care for survivors while also collecting forensic evidence to aid legal investigations and prosecutions of sexual offenses.
The document defines and classifies various sexual offenses under Indian law. It discusses natural offenses like rape, adultery, and incest that involve penile-vaginal penetration. It also covers unnatural offenses like sodomy and oral sex. It provides details on the definition of rape and modifications made by the Criminal Law Amendment Act of 2013. It describes investigations and findings related to different sexual offenses.
This document discusses various aspects of infanticide and determining whether a child was born alive or dead. It defines terms like infanticide, feticide, and filicide. It describes methods to investigate cases, including examining the mother and child. Signs of a live birth include changes in the lungs, stomach/intestines, and middle ear after respiration occurs. Tests like the hydrostatic test examine whether lungs float to determine if air was inhaled. The document discusses characteristics of stillborn and deadborn fetuses, maceration, and radiological signs of intrauterine death.
This document discusses classifications and types of injuries that can occur in transportation accidents. It classifies injuries as those sustained by pedestrians, cyclists, motorcyclists, or vehicle occupants. For pedestrians, injuries are broken down into primary impact injuries from the initial collision and secondary impact injuries from being thrown or sliding after the initial collision. Primary impact injuries depend on factors like the victim's position and height of impact. Common injuries are fractures of the legs. Secondary impact injuries include head injuries from striking the windshield or injuries to the chest, abdomen, and pelvis from striking the vehicle. The document discusses various medical legal indicators for different types of collisions and injuries.
This document discusses abortion from medical, legal, and criminal perspectives. Medically, abortion is defined as the expulsion of a fetus weighing 500g or less that is not viable outside the womb, usually occurring before 28 weeks. Legally, abortion is permitted under the Medical Termination of Pregnancy Act for medical or social indications up to certain gestational ages, by certified providers in authorized facilities. Criminal abortion refers to illegally induced abortions, which were historically performed dangerously and caused infections, injuries, and death. The document outlines abortion methods and their complications.
This document discusses various types of asphyxia including mechanical asphyxia caused by hanging, strangulation, suffocation, and other means. It provides details on the postmortem findings associated with each type of asphyxia. For hanging, typical findings are ligature marks on the neck and petechial hemorrhages. Strangulation often shows bruising in a horizontal band around the neck. Suffocation may result in pallor around the nose and mouth with petechiae on the face. Internal examination generally reveals signs of asphyxia like congestion in the lungs and other organs.
Consent is required for medical examination and treatment. There are three main types of consent: implied, expressed, and informed consent. Informed consent requires fully disclosing relevant information to allow patients to make knowledgeable decisions. Exceptions include therapeutic privilege to withhold information, emergency treatment without consent, and examinations of arrested individuals. Consent requirements vary based on a patient's age, with those under 12 unable to consent and those over 18 able to consent to procedures. Special situations like medico-legal cases, organ donation, and surrogacy have additional consent rules.
This document defines and provides examples of medical negligence and malpractice. It discusses the four elements required to prove negligence: duty of care, breach of duty, causation, and damages. It notes that the burden is on the patient to prove negligence and the doctor to prove innocence. Common acts of negligence include operating on the wrong patient or body part and leaving surgical instruments inside a patient. Defenses for doctors include calculated risk, contributory negligence, vicarious liability, and error in judgment. Negligence can result in civil penalties like compensation or criminal charges under section 304A of the Indian Penal Code.
Medical ethics deals with the moral principles that should guide medical professionals in their dealings with patients, each other, and the state. There are various codes of ethics that have been developed over time to provide guidance. The regulation of medical practice is overseen by organizations like the World Medical Association, National Medical Council, and State Medical Councils. These councils are responsible for functions like recognizing medical qualifications and institutions, handling disciplinary matters, and ensuring compliance with regulations. Both medical professionals and patients have certain rights and responsibilities in the patient-doctor relationship.
Drug dependence and abuse can involve substances that are used to modify physiological systems or explore pathological states. There are three main categories: substance intoxication causes unwanted effects, substance abuse involves excessive drug use inconsistently with medical practice, and substance dependence is a cluster of behavioral and cognitive phenomena due to maladaptive patterns including tolerance and withdrawal symptoms. Common withdrawal symptoms occur when blood concentrations decline after maintaining high levels, and vary based on the drug class. The Narcotic Drugs and Psychotropic Substance Act of 1985 prohibits production, possession, sale, purchase, transport, storage, consumption and amended in 2014 to relieve restrictions on important drugs like morphine.
The Consumer Protection Act 2019 repealed and replaced the previous COPRA act of 1986. It established authorities at the central, state, and district levels to protect consumer interests and effectively handle consumer disputes. The central authority is headed by a Chief Commissioner based in New Delhi. Consumer disputes redressal commissions were established at the national, state, and district levels to handle consumer complaint cases depending on the amount in dispute. The act allows individuals to file complaints within 21 days with the appropriate commission. It also defines limitations periods for reporting negligence or defects. The Transplantation of Human Organs Act 1994 regulates the removal, storage, and transportation of human organs for therapeutic purposes. It prohibits commercial dealings in organs and established an authorization committee to regulate
Impotence is the inability to perform sexual intercourse, while sterility is the inability to conceive children or beget children. Not all sterile individuals are impotent, and not all impotent individuals are sterile. Causes of male impotence include age, developmental defects, local diseases, general diseases, vascular issues, toxicity, drugs, and psychological factors. Examination of potency involves history, physical exam including genitals, and opinion on capability. Contraception and artificial insemination are options when impotence or sterility are present. Legal issues can arise regarding marriage, divorce, paternity, and donation.
This document discusses euthanasia and its classification. It defines euthanasia as voluntarily putting to death a patient suffering from an incurable, terminal, and extremely painful condition. Euthanasia is classified as either active or passive. Active euthanasia is an act of commission, such as a lethal injection, while passive euthanasia is an act of omission, such as removing a patient from life support. The document discusses how passive euthanasia was legalized in India in 2011 through the Aruna Shanbaug case, which allowed for the withdrawal of life support for patients in a vegetative state under certain guidelines.
The document summarizes the court system in India. It begins with definitions of courts and then outlines the hierarchy of courts from the Supreme Court at the national level down to subordinate courts at the district and local levels. The key points are:
- The Supreme Court is the highest court in India and hears appeals from high courts. It is located in New Delhi.
- Below the Supreme Court are 25 High Courts, one for each state or group of states, which hear appeals from lower courts and have original jurisdiction in some cases.
- At the district level are Sessions Courts which try serious criminal cases committed to them by magistrates.
- Below Sessions Courts are various classes of Magistrate Courts which try
The Protection of Children from Sexual Offences Act, 2012 (POCSO Act) provides a comprehensive law to protect children from sexual abuse and exploitation. It defines a child as anyone under 18 years old. The Act establishes special courts for the speedy trial of offenses involving child sexual abuse. It also mandates special procedures for recording a child victim's statement, including allowing for video recordings and ensuring the identity of the child is not revealed. The POCSO Act categorizes different forms of child sexual abuse and prescribes strict punishments including imprisonment and fines. It also has provisions for mandatory reporting of offenses and protection of victims and witnesses.
This document lists ages for the ossification and fusion of various bones in the human skeletal system. Key bones mentioned include:
- Clavicle: Ossification begins at the medial end between 18-20 years and the lateral end between 22-23 years.
- Scapula: Ossification of the acromion and coracoid process begins around 14 years of age.
- Pelvis: The triradiate cartilage begins to ossify between 4-5 months in utero and fuses between 6-7 months.
- Femur: Ossification begins in the head around 1 year of age and the distal end around 9 months in utero.
-
This document discusses methods for estimating age in the living and deceased. It covers dental development, ossification of bones, and secondary sexual characteristics as indicators. For teeth, it describes the eruption schedule of both primary and permanent teeth. It also discusses Gustafson's method for estimating age based on characteristics in dental tissues seen in radiographs. For bones, it provides timelines for ossification at various sites. It notes the medicolegal importance of accurately determining age for issues like legal consent, criminal responsibility, and definitions of infant, child, juvenile, and adult. Overall, the document serves as a reference for the key physical indicators used to assess age in forensic cases.
The document summarizes embryonic development from conception through the 10 months of gestation. It describes the changes that occur each month, including growth in length and weight, physical features, and organ development. Key events include limb bud formation in the first month, sex becoming distinguishable in the third month, and viability beginning around 24 weeks or the seventh month of pregnancy. Ossification centers develop throughout pregnancy beginning in the limbs and skull and progressing to other bones.
This document summarizes various methods used in forensic investigation and analysis of biological evidence from crime scenes. It discusses principles like Locard's exchange principle and provides details on presumptive and confirmatory tests for blood, semen, saliva and other bodily fluids. It also describes techniques like DNA fingerprinting that can be used to identify suspects by matching biological samples left at the crime scene.
Giloy in Ayurveda - Classical Categorization and SynonymsPlanet Ayurveda
Giloy, also known as Guduchi or Amrita in classical Ayurvedic texts, is a revered herb renowned for its myriad health benefits. It is categorized as a Rasayana, meaning it has rejuvenating properties that enhance vitality and longevity. Giloy is celebrated for its ability to boost the immune system, detoxify the body, and promote overall wellness. Its anti-inflammatory, antipyretic, and antioxidant properties make it a staple in managing conditions like fever, diabetes, and stress. The versatility and efficacy of Giloy in supporting health naturally highlight its importance in Ayurveda. At Planet Ayurveda, we provide a comprehensive range of health services and 100% herbal supplements that harness the power of natural ingredients like Giloy. Our products are globally available and affordable, ensuring that everyone can benefit from the ancient wisdom of Ayurveda. If you or your loved ones are dealing with health issues, contact Planet Ayurveda at 01725214040 to book an online video consultation with our professional doctors. Let us help you achieve optimal health and wellness naturally.
PGx Analysis in VarSeq: A User’s PerspectiveGolden Helix
Since our release of the PGx capabilities in VarSeq, we’ve had a few months to gather some insights from various use cases. Some users approach PGx workflows by means of array genotyping or what seems to be a growing trend of adding the star allele calling to the existing NGS pipeline for whole genome data. Luckily, both approaches are supported with the VarSeq software platform. The genotyping method being used will also dictate what the scope of the tertiary analysis will be. For example, are your PGx reports a standalone pipeline or would your lab’s goal be to handle a dual-purpose workflow and report on PGx + Diagnostic findings.
The purpose of this webcast is to:
Discuss and demonstrate the approaches with array and NGS genotyping methods for star allele calling to prep for downstream analysis.
Following genotyping, explore alternative tertiary workflow concepts in VarSeq to handle PGx reporting.
Moreover, we will include insights users will need to consider when validating their PGx workflow for all possible star alleles and options you have for automating your PGx analysis for large number of samples. Please join us for a session dedicated to the application of star allele genotyping and subsequent PGx workflows in our VarSeq software.
Nano-gold for Cancer Therapy chemistry investigatory projectSIVAVINAYAKPK
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The development of nanogold-based cancer therapy could revolutionize oncology by providing a more targeted, less invasive treatment option. This project contributes to the growing body of research aimed at harnessing nanotechnology for medical applications, paving the way for future clinical trials and potential commercial applications.
Cancer remains one of the leading causes of death worldwide, prompting the need for innovative treatment methods. Nanotechnology offers promising new approaches, including the use of gold nanoparticles (nanogold) for targeted cancer therapy. Nanogold particles possess unique physical and chemical properties that make them suitable for drug delivery, imaging, and photothermal therapy.
STUDIES IN SUPPORT OF SPECIAL POPULATIONS: GERIATRICS E7shruti jagirdar
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Are you looking for a long-lasting solution to your missing tooth?
Dental implants are the most common type of method for replacing the missing tooth. Unlike dentures or bridges, implants are surgically placed in the jawbone. In layman’s terms, a dental implant is similar to the natural root of the tooth. It offers a stable foundation for the artificial tooth giving it the look, feel, and function similar to the natural tooth.
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Dive into an in-depth exploration of the histological structure of female reproductive system with this comprehensive lecture. Presented by Dr. Ayesha Irfan, Assistant Professor of Anatomy, this presentation covers the Gross anatomy and functional histology of the female reproductive organs. Ideal for students, educators, and anyone interested in medical science, this lecture provides clear explanations, detailed diagrams, and valuable insights into female reproductive system. Enhance your knowledge and understanding of this essential aspect of human biology.
Know the difference between Endodontics and Orthodontics.Gokuldas Hospital
Your smile is beautiful.
Let’s be honest. Maintaining that beautiful smile is not an easy task. It is more than brushing and flossing. Sometimes, you might encounter dental issues that need special dental care. These issues can range anywhere from misalignment of the jaw to pain in the root of teeth.
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Respiratory issues like asthma are the most sensitive issue that is affecting millions worldwide. It hampers the daily activities leaving the body tired and breathless.
The key to a good grip on asthma is proper knowledge and management strategies. Understanding the patient-specific symptoms and carving out an effective treatment likewise is the best way to keep asthma under control.
3. Forensic Ballistics
• Deals with
1. the investigation of firearms and ammunition
2. Injuries caused by it and
3. the medico-legal problems associated with it
4. Internal ballistics External ballistics
Operation of a firearm and
the movement of the
projectile
Inside the firearm
Study of events
-after the discharge of the
projectile from the firearm
- Till it reaches the target
5. Terminal ballistics vs wound ballistics
• Terminal ballistics motion of the projectile
in the target
• Wound ballistics study of the injury caused
11. Rifling
• The internal surface of the barrel has been
scored by a number of spiral grooves
• More common number is 6
• Sometimes there can be microridges
• Projectile is usually called a bullet
14. • Projecting ridges are called lands
• The deep portions are called grooves
• Distance between diagonally opposite lands is
called calibre
15.
16. • In USA it is measured in Inches 0.22
• In Europe expressed in millimetres
17. Need for rifling???
• Spinning action to the bullet
• Stabilizes its flight/ straight trajectory path
• Prevents wobbling/ tumbling
• Penetrative power increased
• Increases accuracy and range (NEET PG)
18. How to increase the range of firing??
• By increasing the length of the barrel
• So according to that :
– (a) Short barrel firearms
– (b) Long barrel firearms
20. Pistols
Catridges in a vertical magazine
When fired, empty catridge case
falls at some distance away
New catridge slips into the
breach automatically by spring action
Should be reloaded again
Hence, “ Semi-automatic”
21. Revolvers
• In a metallic revolving cylinder
• After firing, the cases remain there
• After one round, it should be loaded manually
again
22. • AK47
• AK 74
• Automatic rifles fire using gases of the
previous
25. Choking???
• Reduction of diameter at the muzzle end of
the barrel.
• Reduces the dispersion of pellets and holds
the pellets together for a longer distance
• Can be non- choke bore/ choke-bore
28. GUAGE
• Indicates the diameter of the barrel
• Determined by no: of lead pellets which can
be made from one pound of pure lead
• Exactly fitting the bore of the shotgun
29. • Smaller the gauge greater the diameter
• Ranges from 10 to 28.
30. CATRIDGE
• Consists of a metallic case in which:
• Projectile pellet/bullet
• Propellant gunpowder
• Primer gives the impulsive spark to ignite
the propellant
31.
32. Functioning??
• Pulling the trigger and released
• Striker goes and hits the percussion cap
• Releases heat
• Primer inside the percussion cap ignites
• Explodes the gunpowder (propellant)
• Projectile is propelled
33. Purpose of wad??
• Plastic/ paper disc
• Acts like a piston
• Propells the pellets together
34. Primary marking and secondary
marking
• In all rifled firearms,
• Cartridges are usually larger than the barrel
• (for perfect obturation)
35. • Thus when a bullet passes through it,
• the markings of the lands on the bullet
–PRIMARY MARKINGS
–Reveal the manufacturer of the gun
• Unique markings typical to the weapon
–SECONDARY MARKINGS
37. Pellets???
• Lead large pellets buckshot/ mould shot
• Single large pellet in shot gun is called SLUG
• Smaller than bore diameter
• Base- hollow
• End-pointed
38. Bullet???
• Are of different sizes and shapes
• Varies from one firearm to another
39. Dum-dum bullet
• It is open at the nose and is covered with a
lead jacket.
• It expands on hitting the target
• Hence produces a larger wound
40. Frangible bullets
• They break into multiple pieces when they
enter the body
• Here, matching with the test bullet is difficult
41. Tandem bullets (Piggy tail/
piggy back bullet)
• It means two bullets come out from a single firing
shot
• Causes:
• (a) defective ammunition where one gets stuck
in the barrel and on subsequent firing the new
bullet comes along with the previous one
• (b) duplex/ tandem catridge manufactured in a
single catridge there will be two bullets one
behind the other
43. Ricochet bullet
• Bullet changes its direction by striking on
some surface or object
Bullets can get deformed
Speed is dampened and hence placed superficial
on the body
44. Types
• External ricochet
• Strikes an intermediate object before entering the body
• Entrance wound may be deformed
• May show foreign bodies from the striking object
• Usually in inferior weapons
46. Medico-legal significance
• In case of external ricochet, unintentional
firing may be used as a defence
• The entrance wound will be larger than the
expected
• Velocity is reduced and may produce a
keyhole injury on the skull
• Gutter fracture on the skull
• Grossly deformed, identification is difficult.
47. Souvenair bullet
• Bullets remain in the body silently
• Sometimes, they are made to remain like that
• Because intervention might cause more
damage.
• Seen encapsulated by fibrous tissue.
• c/c lead poisoning may be seen.
56. Flame = 30 cm Smoke= 45 cm
Unburnt gun powder=
60 to 80cm
57. Wounds caused by shotgun
Product of firing Distance up to
which it travels
Injury caused
Flame 30 cm Burning
Smoke 45 cm Blackening
Unburnt powder grains 60-80 cm Tattooing
Pellets move together Up to 2 metre Single hole
Pellets spread >2 metre Multiple holes
Wad travel Up to 5metres
Metallic fouling due to metals expelled by the discharge
58.
59.
60. Wiping ++
• Tattooing doesn’t go
• Smudging/blackening goes off
• Metal fouling does not go
61. Contact shot
• Explosive injury + Gross destruction of tissues
• Entrance wound:
• Muzzle imprint + Cherry red discoloration
• Burning, smoke and soot inside the track
62. Specific appearance of Contact Shot
• Muzzle/ recoil imprint mark
• Back spatter
• Blowback phenomenon or blast effect-
– Cruciate/ stellate/ragged laceration
– Especially if there is a bone underneath
63. • Clothes were present soot and burns on the
clothes +++
• Exit wounds- depends on the area of injury
• If its head, lesser space for the gas to
expand hence mutilated
• If it is chest or abdomen, a round entry wound
and an exit wound may be there
64.
65.
66. Close range < 30 cm
• Large entrance wound
• Burns singeing of hair
• Blackening / smudging due to smoke
• Tattooing in the periphery
67. 30- 45 cm range
• No burning
• Blackening and tattooing
68. > 45 cm - 80cm
• Only tattooing and central hole
69. 1- 2m
• Single entrance wound with irregular margins
• RAT HOLE APPEARANCE
70. > 2 metres
• Pellets begin to spread
• Central hole
• Surrounded by multiple wounds
• Scattered wounds
71. > 4 metres
• Scattered holes
• No central hole
• All of comparable sizes
72.
73. > 5metres
• Wad would produce a typical irregular
wound
• Dispersion of wounds caused by individual
pellets.
74. Exit wounds from a shotgun
• Contact and close range shots pellets do
make exit wound
• But otherwise they stay within the body
• Thinner body parts like limbs– will have exit
wounds
77. Close shot
• Burning
• Blackening
• Tattooing around the entrance wound
• Entrance wound usually circular
• edges- inverted
78. • Abrasion collar/ contusion collar
• the abrasion caused around the entry wound
due to the spinning action
• Grease collar/ bullet wipe
• dirt and grease on the bullet
85. SMOOTH BORE
CONTACT
SHOT
CLOSE NEAR INTERMEDI
ATE
DISTANT RANGE
< 1 metre 1-2
metre
2-4 metre >4 metre > 5 metre
Stellate
wound
Circular wound Irregular
wound
RAT
HOLE
Central hole
large +
satellite
holes
Individual
pellet
holes
Wad
wound +
individual
pellet
wounds
Muzzle
imprint ++
single Single Multiple
wounds
Multiple
Burns +
blackening+
Tattooing +
In the track
Burns + - upto 30 cm
Blackening +- upto 45 cm
Tattooing +-upto 80 cm
Around the wound
------ -------- ---------
86. Rifled firearm
CONTACT SHOT
Point blank
Close shot
(Range of flame)
Near range
(Range of
gunpowder)
Long range
(beyond that
range)
< 8cm <60 cm
Stellate wound
Muzzle imprint
Circular entrance
wound
Abrasion collar
Circular entrance
wound
Abrasion collar
Wound < bullet
Abrasion collar
Burns
Blackening
Tattooing
(in the track)
Burns +
Blackening+
Tattooing+
Burns –
Blackening—
Tattooing ++
Burns--
Blackening--
Tattooing ---
87. Note :
if there is external ricocheting
abrasion collar may be absent
Blackening, burning , tattooing ---
88. ENTRANCE WOUND vs EXIT WOUND
Character Entrance wound Exit wound
Size Smaller than the diameter Larger
edges inverted everted
Abrasion collar
and grease collar
Present Absent
Scorching,
smudging and
tattooing
Present Absent
Bleeding less more
Fat extrusion less more
Cherry red colour May be present absent
89. Yawing/ tembling
• At the last part of the flight,
• Bullet may rotate in a longitudinal axis. Base
comes in front
• Penetrating power is lost
• Irregular lacerated wound is caused
91. Shored exit wound
• If the body is protected at the point of exit
wound
• Wound will be circular
• With abrasion around
• Bullet will be in the vicinity
92. Entrance wound Exit wound
Size- smaller larger
Edges- inverted everted
Burning blackening tattooing + ---
Abrasion collar and grease collar + ----
Bleeding less more
Fat and other tissues – no protrusion protrusion
Metal ring +++ -----
98. One entrance wound + no exit wound
• Bullet in the body
• Enter the bowel and gets excreted
• May enter trachea and can be spitten out
• May enter the stomach and vomited out
• Deflected throught the same path
99. One entry and multiple exit wounds
• Bullets splitting into two inside the body
• Tandem bullet
• Bullet strikes on the bone comes out with
bone fragment
100. Multiple entry wounds
• Bullet striking and splitting before entering
• Intermediate object secondary missiles+
• Tandem bullets
101. Multiple entrance wounds + single
exit wound
• One may remain and other exit
• One excreted/ coughed
103. Detection of Gunshot residues
• 1. Dermal nitrate/ Paraffin test- non-specific test
• Residues are removed from the suspects hand by
paraffin cast or cotton swab
• Diphenylamine reagent
• Positive test : blue flecks ++
104. • 2. Harrison and Gilroy test
• Qualitative calorimetric test
• Not specific
• But detects antimony, barium and lead
residues
105. • 3. Neutron activation analysis
Detection and measurement of characteristic
isotopes
In a nuclear reactor
Antimony and copper residues from primer
106. • 4. Atomic absorption spectroscopy (AAS)
Or FAAS (Flameless spectrophotometry)
• 5. Scanning electron microscope- energy
dispersive X-ray spectrometry
even minute traces can be detected
• 6. Modified Greiss Test
• Specific For nitrites
• Alpha –naphthol to produce visual display