Chapter 3: Trace Evidence.

This chapter presents information on trace evidence. The term trace evidence is used to describe any small items of evidence. It is rather a generic term, because it signifies a variety of objects, excluding primarily serological and fingerprint evidence. It can often be tiny items that an investigator might miss on first examination. It can also be microscopic items that can be seen only with the aid of a microscope. In many instances, trace evidence has proved to be the means of solving the case--of identifying a suspect or connecting the suspect to the victim. Trace evidence is based on the scientific theory known as the Locard Exchange Principle. Some of the items found at various crime scenes include paint chips, cigarettes and tobacco, matches, glass, hair and fibers.