Bloodstain pattern analysis examines the size, shape, and distribution of bloodstains at a crime scene to determine what physical events caused them. Careful observation of bloodstain patterns can provide information about the direction of travel, angle of impact, and velocity of blood droplets. This analysis is important in forensics as it can be used to prove or disprove a suspect's account of events and help reconstruct the crime.
It is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed. Analysts examine the size, shape, distribution and location of the bloodstains to form opinions about what did or did not happen.
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It is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed. Analysts examine the size, shape, distribution and location of the bloodstains to form opinions about what did or did not happen.
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what things are visible which instruments are used, what are the major functions of the instrument used and which is the best technique used by the scientific officer to compare whether two soil samples are from same area or different area.
age of document , document, paper, writing matter, typescript, printed matter, signature and handwriting, typewriter and various types of type writing devices
Bloodstain pattern analysis (BPA) is the examination of the shapes, locations, and distribution patterns of bloodstains, in order to provide an interpretation of the physical events which gave rise to their origin.
Blood spatters according to some scientific principles. This enables trained analysts to carry out a forensic study on a crime scene and draw valid conclusions.
Analysts examine the size, shape, distribution and location of the bloodstains to form opinions not just about what happened but also what could not have happened at the crime scene.
The study of movement of blood through circulatory system.
cardiovascular system is Responsible for to pump the blood and to circulate it through different parts of the body.
It is essential for the maintenance of pressure and other physical factors within the blood vessels
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2. What is bloodstain pattern analysis?
• The bloodst ain pat t erns lef t by f alling, proj ect ed or
smeared blood can be analysed by t rained crime scene
invest igat ors.
• Caref ul observat ion and measurement of t he posit ion
and shape of bloodst ains can give lot s of inf ormat ion
about t he direct ion of t ravel, angle of impact and t he
speed or velocit y of t he blood droplet s.
3. Definition
Through t he examinat ion of
bloodst ains and bloodst ain
pat t erns, in associat ion
wit h knowledge of t he
underpinning sciences, t hey
provide a det erminat ion of
t he physical event s
responsible f or t heir
deposit ion.
4. Why is it important
in forensics?
• Bloodst ain pat t erns can be used t o prove
or ref ut e a suspect ’s account of what
happened.
• The inf ormat ion f rom t he bloodst ain
pat t erns can possibly be used t o
reconst ruct a crime.
• Bloodst ain pat t ern analysis can t ell us t he
“how” of a crime.
5. Surface tension
• Surface tension is an upwards force that enables
insects such as a water strider to “walk on water”.
7. Travelling blood droplets
• When a f orce is applied t o a mass of blood, t he blood
breaks int o droplet s.
• The droplet s f ly t hrough t he air as “perf ect ” spheres
due t o surf ace t ension.
13. Height and size of blood drops
• A blood droplet released f rom a 1m
height will be smaller t han a blood
droplet released f rom a 1.5m height .
• This is because t he velocit y of t he blood
droplet released f rom a higher height is
great er.
22. Reconstructing the crime
• With the evidence that is collected, the crime scene
investigator attempts to reconstruct the crime.
• This involves trying to work out what events happened
and the order that they happened.
