The common types of physical evidence encountered at crime scenes include hairs, fibers, and paints; drugs, poisons, and arson and explosives evidence; fingerprints; firearms; tool marks; and document and voice examination. Updated techniques are described for forensic analysis as well as procedures and practices relating to proper collection and preservation of evidence at crime scenes. Over 200 illustrations demonstrate laboratory examination of criminal evidence. Particular attention is focused on the meaning and role of probabilistic in interpreting the evidential significance of scientifically related evidence. The latest information on DNA typing explains what DNA is and its role in body chemistry. It also describes the process of DNA fingerprinting and demonstrates its application to criminal investigation in actual cases. Also included are the latest advances in drug testing, computerized fingerprint search systems, and arson investigation. Numerous references, tables, and illustrations