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Trace evidence is very important in forensic investigations. This category of evidence encompasses many diverse types of microscopic materials as well as some examples that are easily visible to the naked eye. The subject is broad and diverse because of the number of different types of evidence that are commonly encountered. Trace evidence can be thought of as evidence occurring in sizes so small that it can be transferred or exchanged between two surfaces without being noticed. Varieties of trace evidence can include, but are not limited to: metal filings, glass fragments, feathers, food stains, building materials, lubricants, fingernail scrapings, pollens and spores, cosmetics, plastic fragments, gunshot residue, chemicals, paper fibers and sawdust, human and animal hairs, plant and vegetable fibers, blood and other body fluids, asphalt or tar, vegetable fats and oils, dusts and other airborne particles, insulation, textile fibers, soot, soils and mineral grains, and explosive residues. Forensic scientists routinely come into contact with a relatively few number of these. They are: hair, glass, paint, fibers, fingerprints, and flammable liquids. These will be covered more in-depth in this paper. Edmond Locard, a French