Blood Spatter Patterns Murder or Self Defense?. Chris Schaefer, OMS II Priya Nileshwar , OMS I Nnaemeka Diribe , OMSI. Types of Patterns. High Velocity. Medium Velocity. Low Velocity. How can we find out where the blood came from?. Pattern Analysis.
Chris Schaefer, OMS II
PriyaNileshwar, OMS I
Select drops of blood with an easily identifiable shape
Measure length and width of droplet
Divide width by length
This gives you the sine of the angle at which the blood impacted the wall
Measure angle with protractor and attach a string next to the droplet at angle of impact
Where all the strings come together gives location of source of blood
This will give you a decimal number
The actual formula (for those of you with a little bit of Trigonometry) is arcsin(number)=angle
We can just estimate with this table
.1 = 6 degree angle.2 = 11 degree angle.3 = 17 degree angle.4 = 24 degree angle.5 = 30 degree angle.6 = 37 degree angle.7 = 45 degree angle.8 = 53 degree angle.9 = 64 degree angle1 = 90 degree angle
How can we know if a killing was due to self defense or murder?
Stewie states that he was defending himself against Brian who was coming after him with a knife. Both of them were standing when this happened. Stewie says he struck Brian in the head while he was still standing.