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Exam #3
Bloodstain Analysis
31
Criminal Justice
Undergraduate 4
12/05/2011

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Cards

Term
Spatter
Definition
Blood has been dispersed as result of force applied to a source of blood - gravity is main source used to analyze blood
Term
Spatter Patterns
Definition
Often characteristic of nature of forces which created them
Term
Info Bloodstain Evidence Can Provide
Definition
Position of victim at time of injury, weapon used, movement of victim, removal of body, storage of body, positional rel of victim to assailant, amount of blood loss
Term
Blood & Human
Definition
Blood accounts for 8% of total body weight; 5-6 liters in males, 4-5 liters in females; 40% blood volume loss is required to produce death
Term
Factors of Pattern Analysis
Definition
Volume, directionality, motion & movement, surface & texture, pressure, force, smudging & smearing, velocity
Term
Spine
Definition
Pointed or elongated stains which radiate away from central area of bloodstain
Term
Satellites/Satellite Spatter
Definition
Small droplets around spine as result of blood impacting target surface
Term
Directionality
Definition
Circular - droplet strikes surface at 90 degrees; elongated or teardrop shape - blood strikes surface at angle less than 90 degrees
Term
Passive Bloodstains
Definition
Falling or dripping; created or formed by force of gravity acting alone
Term
Transfer Bloodstains
Definition
Contact stains; created when wet, bloody surface comes in contact w/ secondary surface - may observe recognizable image of portion of original surface in pattern (example: bloody hand or shoe print)
Term
Projected Bloodstains
Definition
Created when exposed blood source is subjected to action or force, greater than force of gravity
Term
Projected Bloodstain Considerations
Definition
Size, shape - more force the smaller, # of resulting stains will depend on amount of force utilized to strike blood source
Term
Cast-Off
Definition
Projected bloodstain - from swing of object that came in contact w/ source; cessation - object comes to stop
Term
Impact Spatter
Definition
Created when blood source receives blow or force resulting in random dispersion of smaller spatter - low, medium, high velocity
Term
Spurt/Gush
Definition
Large amount of blood comes out of small opening, spurted out by pressure; if hit in artery, every time heart beats, blood is spurted out - subsequent heart beats have less pressure
Term
[image]
Definition
Blood spatter - droplet
Term
[image]
Definition
Blood spatter - satellites
Term
[image]
Definition
Blood spatter - secondary spatter
Term
[image]
Definition
Blood spatter - circular (directionality)
Term
[image]
Definition
Blood spatter - teardrop (directionality)
Term
[image]
Definition
Blood spatter - passive, falling or dripping 90 degrees above stain
Term
[image]
Definition
Blood spatter - passive, actual scene
Term
[image]
Definition
Blood spatter - transfer, contact stain
Term
[image]
Definition
Blood spatter - transfer, contact stain
Term
[image]
Definition
Blood spatter - projected
Term
[image]
Definition
Blood spatter - projected, cast-off
Term
[image]
Definition
Blood spatter - projected, arterial spurt/gush
Term
[image]
Definition
Blood spatter - projected, spurt actual scene
Term
[image]
Definition
Blood spatter - impact spatter, low velocity
Term
[image]
Definition
Blood spatter - impact spatter, medium velocity
Term
[image]
Definition
Blood spatter - impact spatter, high velocity
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