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Blood Splatter Analysis

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Shelby Vaughn

on 5 February 2014

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Transcript of Blood Splatter Analysis

Thank you for listening!
Safety Precautions and Materials
Pull back long hair into a ponytail in order to hair out your face and out of the experiment.
Wear goggles to protect your eyes from splashing liquids.
Wear gloves to prevent staining hands with dye and protect yourself while touching hazardous materials.
A plastic bag was taped down to protect and keep our work area clean.
We used a ruler to mark ten centimeter intervals on a line of tape, which was placed on the back wall of our work area.
Micro-pipette and liquids to perform experiment.
A pencil and paper to record the data
What we found..
(Table on page 2 of printed report)
Questions and Answers
1. How does height correspond with the diameter of a blood splatter?
2. Why are the water splatters larger in diameter than the blood splatters?
Blood Splatter Analysis
By: Katelin Baird, Liz Choe, Chuntai Barrow, and Shelby Vaughn
1. Prepare workplace by stabilizing the plastic bag and gathering proper materials.
2. Collect water using micro-pipette and dispense at the lowest interval marked.
3. Circle the blood spatter and record the diameter.
4.Repeat steps 2 and 3 for the rest of the marked heights using the control group, then the experimental group.
5. Graph and analyze recorded data
Control Group
Blood Replica and Control Group
What is a blood spatter analysis?
A blood spatter analysis is a form of forensic science, in which crime scene investigators study physical characteristics of spatters to determine what events took place. These characteristics include shape, size, location, distribution, and the angle of impact.
Who is Anna Garcia
Anna Garcia is a woman being studied by PLTW Principle of Biomedical students. She was found dead in her home, bleeding from her head. It is the students' jobs to discover and justify Anna's cause of death.
The purpose of doing a blood splatter analysis on Anna is to determine from what height she started bleeding and fell.
If Anna fell while standing, than the blood splatter would be low velocity (or less than 8 millimeters in size.)
Experimental Information
Independent Variable
: Height the blood was dropped from
Dependent Variable
: The measurement of the blood spatters diameter
Control Group
: Water and Food Coloring
Experimental Group
: Blood replica
Expected outcome
: The diameter of blood spatters will increase as the height they are dropped from increases
Here are the results of our blood spatter analysis. In the chart, above you can see that the smallest blood spatter near Anna's head matches the diameter of the blood spatter dropped 50 cm high. The largest splatter near her head was a about 10 mm in diameter, which matches best with the splatters dropped from 90 cm.
This is a graph of the data collected from the experiment. As you can see, the height affect the diameter of the blood splatter, because in both the experimental group and control group the diameters increased as the height they were dropped from increased.
From our experiment, we observed that, as you increase the height from which you drop the blood, the diameter also increases in size. We noted that at 10 cm the diameter was at 5mm. As we increased the height to 90cm the diameter was at 10mm etc...
In conclusion, the control experiment helped us compare water's density with the blood's density. Our hypothesis was incorrect because the blood splatter that matched the one at the crime scene was 10mm in diameter, which would result in a medium velocity spatter (Freemen). The height that corresponds with the largest spatter at the crime scene was 90 cm.
Freeman, Shanna. (2008, April). How Bloodstain Pattern Analysis Works. How stuff works.
Retrieved from: science.howstuffworks.com/bloodstain-pattern-analysis3.htm

Project Lead the Way- PBS Project 1.1.6 (page 1) Blood spatter analysis

Rankin, Stephanie. (N/A). Bloodstain Pattern Analysis. Forensic Science Central. Retrieved from: forensicsciencecentral.co.uk

This Concludes Our Blood Splatter Analysis
Full transcript