1. Blood Spatter

2. Position of victim & perpetrator
Use laws of physics
Blood – high viscosity (= liquid’s resistance to flow)
Blood – high surface tension – allows blood to retain its shape when contacts other object

3. Velocity blood travels as it leaves body combines with gravity producing a certain path
Low-velocity spatter
- if person moves after losing blood from stab wound, blood falls down  large droplets

4. Medium-velocity spatter
- from blunt force trauma
- blood spurts out from body

5. High - velocity spatter
- from gunshot wounds
- tiny droplets, like a fine spray

6. Arterial spray
- based on heartbeat pattern

7. Useful in determining:
- position of victim
- type of weapon or tool used
- # of times victim was hit, shot, or stabbed
- if victim moved after assault

8. After evaluation, may determine:
Events of crime
Sequence of events
Who was or was not present