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...
CHRIS SCHAEFER, OMS I IPRIYA NILESHWAR, OMS INNAEMEKA DIRIBE, OMSI
Blood Spatter Patterns
Murder or Self Defense?
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 lengthThis 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
WidthLength
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?