TRACE EVIDENCE.

This article discusses the application of modern scientific methods to the examination of small objects and materials present in minute quantities or trace evidence in criminal investigations. The quantities of these materials are such that they may be overlooked without methodical searching, and often special means of detection are needed. Microscopic examination is most frequently involved while the use of special photographic methods. The basic concept of handling trace evidence is the same as in the handling of other types of physical evidence. This involves the identification of material left at the scene with material found on or in the possession of a suspect. Absolute identification of evidential materials is often not as important as establishing the fact that the two materials are identical in all observable characteristics and came from the same source. A listing of all things or materials which might at one time or another become important as evidence would be impossible. In identifying an individual, designation of sex can eliminate a large percentage of suspects, but it does not let us arrive at a positive identification of a particular individual. The team work of investigator, scientist, and members of the legal profession should improve the finding of factual evidence and its presentation in court.