CHRIS SCHAEFER, OMS II PRIYA NILESHWAR, OMS I NNAEMEKA DIRIBE, OMSI Blood Spatter Patterns Murder or...
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Transcript of CHRIS SCHAEFER, OMS II PRIYA NILESHWAR, OMS I NNAEMEKA DIRIBE, OMSI Blood Spatter Patterns Murder or...
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CHRIS SCHAEFER, OMS I IPRIYA NILESHWAR, OMS INNAEMEKA DIRIBE, OMSI
Blood Spatter Patterns
Murder or Self Defense?
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Types of Patterns
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High Velocity
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Medium Velocity
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Low Velocity
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How can we find out where the blood came
from?
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Pattern Analysis
Select drops of blood with an easily identifiable shape
Measure length and width of droplet
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Pattern Analysis
Divide width by lengthThis gives you the sine of the angle at which the blood impacted the wall
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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
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Which Drops are Good?
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Good!
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Which Drops are Good?
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Bad!
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Measure Length and Width
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Divide Length by Width
WidthLength
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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
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Math?!? Say What?
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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
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Measure Angle and String
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Area of Convergence
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Case
How can we know if a killing was due to self defense or murder?
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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.
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Evidence
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Is he telling the truth?
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High or Low Velocity ?
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Good or Bad Pattern?
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Good Pattern must have a
tail.True/False?