Bloodstain pattern Flashcards
The information gained from bloodstains.
____ did the blood come from.
_____ caused bleeding.
direction object ____ from.
where did victim and assailant ____ and ____ to.
____ of strikes.
Evidence fit witness ____.
Where object struct start move number fit
Blood moves and behaves under the ________.
Drops travel like ____ in motion. Land with a specific pattern depending on ____, ____, ____, etc.
laws of physics
projectile
size, angle, velocity
Measuring the width and the length of the bloodstain allows investigators to determine ___ of the impact. Stain takes a specific shape ____ to ____ depending on the angle.
angle
elliptical to circular
What is the name of the little drops of blood that separate from the initial drop?
satellites
___ make the blood clot. When it clots, it will separate into a yellow liquid called ____ and a red clot.
proteins
serum
Liquid = _____ have passed
Shiny jelly-like = _______ have passed
Separated = _______ have passed?
minutes
up to an hour
more than an hour
Proteins in the blood create ___ ____.
Blood also contains ____ that contain ____ (individual).
___,____,_____ can also be located in blood.
blood types
cells DNA
drugs, poison, alcohol
Passive bloodstain is only affected by _____. It is caused by blood _____ from an object/person.
Gravity
dripping
Projected bloodstains are affected by ______. This gives rise to ______ which is a constellation of bloodstains.
force other than gravity
blood splatter
Low velocity:
Less than ___ feet/second.
___ drops. More than ___mm.
5
large
4
Medium velocity:
Between ___ and ___ feet/second,
Drops from ___ to ___mm.
produced by the impact of a ___ or ___ object.
5-100
1-4
blunt
sharp
high velocity:
more than ___feet/second.
fine mist, drops less than __mm.
caused by _____ or ________.
100
1
bullet wounds
high speed machines
The fine mist can be found on the shooter or behind the victim.
When in front: ___ wound.
When in the back: ____ wound.
exit
entry
Explain the difference between impact splatter, projection splatter and combination spatter.
Impact: object
projection: cast off
combination both
What can we determine with a projection spatter?
a number of arcs number of strikes.
What is the name of the 2 points that can help us figure out where was the victim at the moment of the crime?
convergence and origin
what is the directionality?
The course followed by the drop
What is the impact angle?
the angle at which the drop hit the surface.
The point of convergence is in __D. What is this point?
2
Point where all the lines of each drop meet.
What is the marge of error of the point of origin?
2 feet
What are the steps to finding the point of origin?
1- pole as an axis
2- one string for each droplet
3- the angle of the impact with from of drop.
4- where strings meet = point of origin.
What is the void and what can it help us find?
empty space in the middle of a blood splatter. 1- assailant 2- object moved. 3- location of the victim 4- if the body was moved. 5- if the body was moved 6- determine what produced bloodstain.
