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Heather Anne Yeakel.  To further understand the field of forensic science with regard to blood spatter  To discover whether or not weapons that cause.

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Presentation on theme: "Heather Anne Yeakel.  To further understand the field of forensic science with regard to blood spatter  To discover whether or not weapons that cause."— Presentation transcript:

1 Heather Anne Yeakel

2  To further understand the field of forensic science with regard to blood spatter  To discover whether or not weapons that cause blunt force trauma would create different patterns of blood spatter

3  Blood spatter and the reasons spatter patterns differ was researched  Specifically, high, medium, and low velocity spatter and the different causes of these spatters  Blunt force trauma weapons mainly cause medium velocity spatter, that was researched further

4  If a fist, plank of wood, and bat impact a sponge, then their spatter patterns will be both numerically and visually different

5  1 Card Board Box  1 Sponge  1 Bat  1 Plank of Wood  1 Human Fist  1 Measurement Grid (3cm)  White Paper  Fake Blood  44 g of Corn Starch  80 mL water  160 mL Corn Syrup  Red Food Coloring  Green Food Coloring

6  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

7  Independent Variable ◦ Weapon used to strike sponge  Dependant Variable ◦ Spatter pattern created by weapon  Constant Variable ◦ Set up of the box

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9 Average Number of Blood Spatter FistWoodBat Back Front Right Front Left Right Side Left Side

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11 Standard Deviation FistWoodBat Back Front Right Front Left Right Side Left Side

12 P VALUES Back Fist/ Back Wood8.64E-17 Back Fist/ Back Bat9.78E-50 Back Wood/ Back Bat4.10E-07 Right Side Fist Right Side Wood4.11E-06 Right side Fist/ Right Side Bat2.55E-38 Right Side Wood/ Right Side Bat4.80E-30 Left Side Fist/ Left Side Wood1.55E-23 Left Side Fist/ Left Side Bat3.78E-43 Left Side Wood/ Left Side Bat8.11E-03 Right Front Fist/ Right Front Wood7.28E-04 Right Front Fist/ Right Front Bat1.53E-12 Right Front Wood/ Right Front Bat4.04E-09 Left Front Fist/ Left Front Wood3.56E-08 Left Front Fist/ Left Front Bat4.52E-10 Left Front Wood/ Left Front Bat

13  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

14  Force of impact  Angle of impact  The amount of blood soaked in the sponge  The place where the sponge was struck

15  Akin, L. L. (2004, May 23). Directional Analysis of Blood Spatter at Crime and Accident Scenes for the Private Investigator. Retrieved from  "Blood Spatter." World of Forensic Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Gale Cengage, eNotes.com Oct, 2011  Choosing A Baseball Bat. (n.d.). Retrieved 2008, from  Crime Scene Reconstruction and Blood Spatter Analysis. (n.d.). Retrieved October 8, 2011, from  Ely, Catten. “The Forensic Practice of Blood Spatter Interpretation.” suite 101. N.p., 14 June Web. 30 Jan  Interpreting Blood Stain Patterns. (n.d.). Retrieved from Crime Scene Forensics LLC website:  Lerner, E. K. L., Lerner, B. W., & Cengage, G. (2006). Blood Spatter. Retrieved October, 2011, from  Nelson, B. (2011, January 3). Blood Spatter. Retrieved from Deviant Crimes website:  Nowack, L., Collins, R., Li, G., Carter, A., Illes, M., Gorman, V.,... Stotesbury, T. (2011, November 3). Computer Analysis of Blood Stain Patterns on Angled Surfaces [Informative Journal ]. Retrieved from  Reynolds, M. (n.d.). Blood Spatter. Forensic Investigations. Retrieved from


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