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Crime scene investigation and analysis includes everything that happens to document, locate, preserve, collect, and interpret evidence found at a crime scene. It also includes what happens to evidence after it is collected from the scene. Without careful attention to these processes, evidence could be missed or contaminated, which makes it more difficult to solve crimes.
Accuracy of Forensic Photo Scales
Forensic scientists use rulers/photo scales when photographing a crime scene or a piece of evidence to objectively indicate its size. To test the conformity of various American Board of Forensics Odontology (ABFO) #2 Rulers and equivalents against existing accuracy guidelines published in a 1988 Journal of Forensic Science article, we conducted a surveillance exercise. In December 2011, we purchased five rulers from ten different vendors and used our vision measurement system to measure the distance between the zero mark and each centimeter mark to test each scale’s accuracy. The results of these experiments will be published soon.