Souvenir Bullet- lodged and remained in the
body
2. Bullet Migration- not lodged in a place where
it was previously locate...
Complete DESCRIPTION of the wound
2.
LOCATION
a) Part of the body
b) Distance from the mid-line
c) Distance from the heel ...
1.
2.
3.

Odor of the gas inside the barrel
Chemical changes inside the
barrel
Evidences that may be deduced
from the woun...
AUTOMATIC PISTOLS VERSUS REVOLVER

Location of the empty shells- driven out/inside cylindrical
chamber
2. Nature of the sp...
1.
2.
3.
4.
5.

Location and extraction of
the bullet;
Reveal fragmentation and
their location
Show bone involvement
Revea...
•
•
•

Shoulder-fired
Smooth barrel
One or more round balls or
pellets

CLASSES OF SHOT
•
•

•
•

Bird shot- 0.05 to 0.15 ...
•

Contact wounds
of chest &
abdomen
– Circular in

configuration

10/16/2013

13


Contact to 2 ft
› Circular
› ¾ - 1 inch diameter

10/16/2013

14


3ft
› Scalloped margins

due to separating
pellets

•

4 ft
– 1 inch diameter
– Scattered satellite

pellet holes

10/1...
•

Approx. 10 ft
– Ragged

central hole
surrounded by
numerous
pellet holes


Beyond 10 ft
› Multiple pellet

holes

10/16/2013

17
PNP Crime Lab

Shot gun
10/16/2013

18
Shot gun
10/16/2013

19
•Measure the distance between the two farthest
shot (pellets) in inches and subtract one , the
number thus obtained will g...
DETERMINATION OF THE PRESENCE OF
GUNPOWDER COMPONENTS AND PRIMER
COMPONENTS

Importance of determining the Gunpowder
on th...
Tests for the Presence of Powder Residues
1. On the Skin (Dorsum of the Hand or Site of the
Wound of Entrance)
a) Dermal N...
FIREARM IDENTIFICATION
The following factors must be utilized in the identification of the firearm
used in the commission ...
Ballistics May Be Subdivided into Three Separate and
Distinct Area of Study

1)Interior Ballistics
2) Exterior Ballistics
...
Basic Principles Involved in Firearm Identification
1) The quality of metal is very much harder and resistant
to deformity...
Instruments used in Firearm Identification
1) Comparison Microscope
2) Bullet Recovery Box
3) Hand Lens
4) Sharp pointed i...
MARKS FOUND IN THE SHELL
1) Of the Firing pin
2) From the extractor
3) Of the ejector
4) From the breechblock
5) On the cy...
Report re gsw
Report re gsw
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Report re gsw

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  • These materials exiting the muzzles are deposited on the skin and clothing of the subject. In turn will give info on the distance of the muzzle to the subject.
  • Stellate wound is characteristic of a hard contact wound on the head, wherein the bone immediately underlines the skin.
  • Bright yellow flame Most of gunoiwder propelled into the bullet woundAt 6-7 inches, abundant gun powder and dimishing amount of soot/smudge
  • 6-7 inches, abundant gunpowder and dimishing smudge, > 6 inches no soot visibleAt a distance 2x the barrel length, tattoing can be observedMore densely scattered and extends over a larger area on the side from which the shot was fired.
  • Abrasion ring – not due to heat or or rotary movement
  • Report re gsw

    1. 1. Souvenir Bullet- lodged and remained in the body 2. Bullet Migration- not lodged in a place where it was previously located Bullets Embolism- carried by circulating blood to some parts of the body 3. Tandem Bullet- two or more bullets leaving the barrel one after another 1.
    2. 2. Complete DESCRIPTION of the wound 2. LOCATION a) Part of the body b) Distance from the mid-line c) Distance from the heel or buttock 3. DIRECTION and LENGTH of bullet tract 4. ORGANS or TISSUES INVOLVED 5. LOCATION of missile if lodged; 6. DIAGRAM, PHOTOGRAPH, SKETCH or DRAWING 1. 1. 2. 3. 4. 5. 6. 7. 8. TO ANSWER IN COURT Could the weapon inflict the wound? What Range? DIRECTION of the fire. Possibility that the wound is self inflicted. Signs of struggle. Resistance after the injury. Died instantaneously. Relative positions of the involved
    3. 3. 1. 2. 3. Odor of the gas inside the barrel Chemical changes inside the barrel Evidences that may be deduced from the wound  Can the direction of the shot be determined from the direction from which the shot came from? Not possible  Can the firearm be identified by the sound of the discharge? Impossible. Accustomed-may be
    4. 4. AUTOMATIC PISTOLS VERSUS REVOLVER Location of the empty shells- driven out/inside cylindrical chamber 2. Nature of the spent bullet- copper jacketed/no such coating (not true in all cases) 3. Nature of the base of the cartridge or spent shell- no difference/ wider diameter than that of the cylindrical body 1.
    5. 5. 1. 2. 3. 4. 5. Location and extraction of the bullet; Reveal fragmentation and their location Show bone involvement Reveal trajectory Show the effects of the bullet wound
    6. 6. • • • Shoulder-fired Smooth barrel One or more round balls or pellets CLASSES OF SHOT • • • • Bird shot- 0.05 to 0.15 “ diameter, from 200 to 400 shots Buckshot- 0.24 to 0.33 “ in diameter, fewer shots. 12 gauge- 9 shots Single projectile- single shot or slug LETHAL RANGE- an area of 35 to 40 “ in diameter at 30 to 40 yards
    7. 7. • Contact wounds of chest & abdomen – Circular in configuration 10/16/2013 13
    8. 8.  Contact to 2 ft › Circular › ¾ - 1 inch diameter 10/16/2013 14
    9. 9.  3ft › Scalloped margins due to separating pellets • 4 ft – 1 inch diameter – Scattered satellite pellet holes 10/16/2013 15
    10. 10. • Approx. 10 ft – Ragged central hole surrounded by numerous pellet holes
    11. 11.  Beyond 10 ft › Multiple pellet holes 10/16/2013 17
    12. 12. PNP Crime Lab Shot gun 10/16/2013 18
    13. 13. Shot gun 10/16/2013 19
    14. 14. •Measure the distance between the two farthest shot (pellets) in inches and subtract one , the number thus obtained will give the muzzle-target distance in yards. • The character of the wound and the degree of dispersal is influenced by the muzzle-target distance, gauge of the shotgun, degree of choke and the type of ammunition. •A close shot produces more serious injuries because the shots are concentrated on a specific target and because of greater kinetic energy of the pellets.
    15. 15. DETERMINATION OF THE PRESENCE OF GUNPOWDER COMPONENTS AND PRIMER COMPONENTS Importance of determining the Gunpowder on the Skin : 1. Determination of the distance of the gun muzzle from the victim’s body when fired 2. Determining whether a person has fired a firearm
    16. 16. Tests for the Presence of Powder Residues 1. On the Skin (Dorsum of the Hand or Site of the Wound of Entrance) a) Dermal Nitrate ( Paraffin test, Diphenylamine test,Lung’s Test or Gonzales Test 2.On Clothings (esp Colored Ones) Walker’s Test ( C acid , H acid test)
    17. 17. FIREARM IDENTIFICATION The following factors must be utilized in the identification of the firearm used in the commission of crime: 1. Caliber of the Weapon 2. Fingerprints 3. Fouling of the Barrel 4. Serial Number 5. Ballistics Examination- firearm identification
    18. 18. Ballistics May Be Subdivided into Three Separate and Distinct Area of Study 1)Interior Ballistics 2) Exterior Ballistics 3) Terminal Ballistics Medical Ballistics
    19. 19. Basic Principles Involved in Firearm Identification 1) The quality of metal is very much harder and resistant to deformity as compared with the quality of metal used in the manufacture of the cartridge- part of the gun can easily be impressed on the shell or bullet. 2) Certain physical characteristics of certain type of caliber which differentiate it from others of different manufacturer. 3) No two firearms can be manufactured with identical surface characteristics. This is referred to as individual characteristics.
    20. 20. Instruments used in Firearm Identification 1) Comparison Microscope 2) Bullet Recovery Box 3) Hand Lens 4) Sharp pointed instrument for scraping I.D. marks 5) Caliper 6) Analytical Balance Types of Marking on the Examination through the Comparison Microscope 1) Impression Type Mark ( Stamp Mark) 2) Striation or Serration mark
    21. 21. MARKS FOUND IN THE SHELL 1) Of the Firing pin 2) From the extractor 3) Of the ejector 4) From the breechblock 5) On the cylindrical surface of the shell MARKS FOUND IN THE BULLET 1) Number of Lands and Grooves 2) Direction of the twist of the rifling marks

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