I present the class with the challenge of determining what happened at the scene of the "Clean Getaway." I provide them with a series of digital photos taken of parts of the floor at the crime scene. Each photo includes a protractor for scale.
Step 1: Required Materials
shampoo (this is why its called the clean getaway!)
a generous amount of red food coloring
a few drops of blue food coloring
The amount of coloring you need depends on the original color of the shampoo. Once you think you have a good color, smear a little on white paper to see the color.
disposable gloves for students
lab aprons for students
large knife smeared with fake blood and put inside evidence bag (I used a plastic baggie with a zipper closure.)
supply of fake blood for students
prepared crime science blood spatters
access to a computer
photo analysis software
Step 2: Preparing the Crime Scene Splatters
Once the fake blood has dried a little, place a protractor on the paper and photograph it from directly above the paper.
I created six different crime scene photographs so that each of my lab groups had a separate photograph to analyze during the activity.