Studied by 0 people
Blood Spatter
Serology
a broad range of lab tests using reactions of blood serum and other body fluids
presumptive blood tests
Kastle-Meyer test and luminol test
three questions we ask before blood testing
is it blood?, is it human blood?, can it be associated with an individual?
what are the 4 different blood types?
A,B,AB,O
Blood that is many years old can still be analyzed for DNA
True
what class is blood typing >
class evidence
it is cheaper and less time consuming that DNA profiling.
true
How do investigators test to see if the meter is indeed blood?
using tests that are portable
Trajectory
where the blood came from and how it spread over the surface
when measuring a blood stains what can we determine?
the direction and the speed
blood drops from different shapes and sizes
true
blood drops fall as small spheres
true
size depends on speed of blood drop
true
what velocity is this?
low velocity
what velocity is this?
medium velocity
what velocity is this?
high velocity
Free falling leave???
passive drops, leaving large drops
the higher the energy of the impact, the smaller the drops are
true
blood always travels in the direction of the _____?
applied force
Investigators have been using blood stains interpretation as a means to re create crime scenes since_____?
1939
blood spatter patterns can determine?
direction, angle of impact and the point of origin.
What is directionality?
can be determined by analyzing the tail of the blood stain (remember tail tells the tale)
passive drops fall from?
90 degree
the more circular closer to 90 degrees
true
investigators use stringing to find____?
area of convergence
crime scene reconstruction
the act of physically recreating crime scene events in an attempt to better understand the events thats surround a crime
Physical
best describes blood spatter
blood drops on the outside of the main blood droplet
satellites
spiky on the ends
spines
the most common type of blood stains patterns found at a crime scene
impact spatter
the acute angle formed between the direction of a blood drop and the plane of the surface it strikes
angle of impact
what is the avg. velocity of a high velocity impact Spatter?
100 ft/sec
