Heather Anne Yeakel
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The reason I choose this experiment was to
begin to further understand the field of
forensic science with regard to blood spatter
I hoped to discover weather or not weapons
that cause blunt force trauma would create
different patterns of blood spatter
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To create my hypothesis I researched blood
spatter and the reasons spatter patterns
differ
Specifically, I researched high, medium, and
low velocity spatter and the different causes
of these spatters
Also, because blunt force trauma weapons
mainly cause medium velocity spatter, that
was researched further
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After research, a hypothesis was developed
that stated:
◦ If a fist, plank of wood, and bat impact a sponge,
then their spatter patterns will be both numerically
and visually different
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The materials I used to conduct this experiment
are:
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1 Card Board Box
1 Sponge
1 Bat
1 Plank of Wood
1 Human Fist
1 Measurement Grid (3cm)
White Paper
Fake Blood
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44 g of Corn Starch
80 mL water
160 mL Corn Syrup
Red Food Coloring
Green Food Coloring
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Fake blood was created according to the
recipe on the materials slide
For each trial a sponge was soaked in the
blood solution and then placed in a
cardboard box lined with white paper
The weapons were used to strike the sponge
This was done three times with each weapon
and the paper was changed between each
trial
The spatters were then analyzed using a grid
system and the data was recorded
Standard Deviation
Fist
Wood
Bat
Back
0.17
22.94
20.05
Front Right
6.48
6.38
19.93
Front Left
12.37
24.4
17.14
Right Side
3.47
8.36
21.04
Left Side
2.35
18.86
14.89
P VALUES
Back Fist/ Back Wood
8.64E-17
Back Fist/ Back Bat
9.78E-50
Back Wood/ Back Bat
4.10E-07
Right Side Fist Right Side Wood
4.11E-06
Right side Fist/ Right Side Bat
2.55E-38
Right Side Wood/ Right Side Bat
4.80E-30
Left Side Fist/ Left Side Wood
1.55E-23
Left Side Fist/ Left Side Bat
3.78E-43
Left Side Wood/ Left Side Bat
8.11E-03
Right Front Fist/ Right Front Wood
7.28E-04
Right Front Fist/ Right Front Bat
1.53E-12
Right Front Wood/ Right Front Bat
4.04E-09
Left Front Fist/ Left Front Wood
3.56E-08
Left Front Fist/ Left Front Bat
4.52E-10
Left Front Wood/ Left Front Bat
0.50935217
Average Number of Blood Spatter
Fist
Wood
Bat
Back
0.02
11.41
20.2
Front Right
1.47
4.41
22.7
Front Left
0.85
14.27
18.13
Right Side
2.37
5.92
18.44
Left Side
7.57
23.07
21.14
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It was learned in this experiment that a fist, a
plank of wood, and a bat created different
blood spatter patterns both visually and
numerically
If further experimentation was to be done a
device should be created to guide the weapon
to the sponge to ensure the weapons impact
the sponge at the same angle
To further expand on this topic this
experiment could be preformed with weapons
that create high velocity spatter