Blood spatter patterns murder or self defense
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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.

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Blood Spatter Patterns Murder or Self Defense?

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Blood Spatter PatternsMurder or Self Defense?

Chris Schaefer, OMS II

PriyaNileshwar, OMS I

NnaemekaDiribe, OMSI


Types of Patterns


High Velocity


Medium Velocity


Low Velocity


How can we find out where the blood came from?


Pattern Analysis

Select drops of blood with an easily identifiable shape

Measure length and width of droplet


Pattern Analysis

Divide width by length

This gives you the sine of the angle at which the blood impacted the wall


Pattern Analysis

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


Which Drops are Good?


Good!


Which Drops are Good?


Bad!


Measure Length and Width


Divide Length by Width

Width

Length


Determining Angle

This will give you a decimal number

The actual formula (for those of you with a little bit of Trigonometry) is arcsin(number)=angle


Math?!? Say What?


Determining 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


Measure Angle and String


Area of Convergence


Case

How can we know if a killing was due to self defense or murder?


Story

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.


Evidence


Is he telling the truth?


High or Low Velocity ?


Good or Bad Pattern?


Good Pattern must have a tail.True/False?


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