Blood Evidence

surface texture

_____ is of paramount importance. It directly impacts the blood stain’s shape and size.

4.5-6

healthy adults contain about ____ liters of blood

low velocity splatter

drops with diameters of 4mm or more normally produced by an applied force of up to 5ft/sec.

medium velocity splatter

drops with diameters from 1-4mm with an applied force of 5 to 25ft/sec

high velocity splatter

drops with diameters of less than 1mm from an applied force of 100ft/sec or faster

narrow

The ____ end of a blood splatter indicates the direction of travel.

angle of impact = width/length

what is the angle of impact formula

equal

circular angle of impact ratios are ___ to/than 1.0

greater

elliptical angle of impact ratios are ___ to/than 1.0

longer

the lower the angle of impact, the ___ the pattern of blood splatter

secondary

satellite blood spatter is from ____ mechanisms

impact

gunshot, beating/stabbing, power tools, etc. generate blood spatter from ____ mechanisms

projection

cast-off, arterial, and expirated blood spatter is generated from ____ mechanisms

transfer

the result of an object wet with blood contacting a non-bloody surface and transferring blood to that surface

smear

a non descript transfer stain on a surface that has been produced by contact with a bloody object

swipe

a moving object wet with blood contracting a non-bloody surface that may indicate directionality

wipe

when an object moves through existing blood moving from the original stain altering its appearance

drag

exiting pool is altered by movement of a victim or object

passive

this blood staining results from solely gravity alone

active

this blood staining results from an action through crime