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Blood Spatter Activity

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by

Haard Shah

on 24 March 2015

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Transcript of Blood Spatter Activity

Does greater impact equate a larger radius of blood splatter?

Objective
Research Question
Procedure
Procedure CONT'D
Procedure CONT'D
Procedure CONT'D
Results
Analyze the blood splatter using a higher force of impact.
Analyze the arch of blood as it splatters
Measure the amount of blood involved in the experiment
Calculate the velocity of the object coming towards the subject at that exact time.
Be able to accumulate a 360 degree view of the deceased subject.
Be able to predict the projectiles of the blood from the angles
Further Research
Blood Pattern Analysis
Replicate a car accident with significant impact on the skull
Analyze blood splatter patterns
Background
DISCUSSION:
Obtain 2 similar wooden blocks
Get a sponge
Velocity
Obtain 50 mL of blood in a beaker
Low Velocity
(Stabbed)
Blood that falls at the speed or force of normal gravity
These spatters usually fall from an open wound, or from a surface that is saturated with blood
Medium Velocity
(Being hit by a blunt object)
Produced with more energy or force than gravity
The force of the impact causes the blood to break into smaller size spatters relative to the amount of force applied
High Velocity
(Gunshot wound)
Impact spatter that measures less than 2mm in diameter
The force necessary to produce this size spatter is greater than 100 ft per second
Completely soak the Spounge
History
The first known study of blood spatters occurred at the Institute for Forensic Medicine in Poland, by Dr. Eduard Piotrowski.
Later on a number of publications describing various aspects of blood stains were published
The first formal bloodstain training course was given by MacDonnel in 1973
Trial 1 Summary
Mean length: 0.47 cm
Mean distance from the point of impact: 41.375
Trial 2 Summary
Mean Length: 3.22 cm
Mean distance from the point of impact: 79.11cm
Tape to wood as shown
Put the spounge in the middle
Apply light impact on the top block.

After the impact, record the lengths and angle of each blood drop. To measure angle: draw the horizontal line across the paper in any dimension, and then record the angles measured according that line, starting from the center of impact.
Set up environment!
Next: Repeat the steps again, except use greater impact on the top wooden block and record the angle, length, and direction of the blood splatter.
By: Stephen, Alex, Richal, and Haard
Eduard Piotrowski
The trajectory of blood after impact
Impact
Full transcript