ABSTRACT
Scent identi cation procedures, particularly scent lineups, differ from narcotics or explosives detection work in that the dog must match an odor on an item believed to have been touched by the perpetrator at a crime scene to an item touched by a suspect in that crime, such as a metal tube in an row of tubes, the rest of which have been touched by other individuals having nothing to do with the crime. The items not touched by the suspect are called foils. Either that, or particularly in older cases, the dog matched the odor on the crime scene item to a row of individuals, one of whom was the suspect. This is closer to the traditional sight lineup used for witnesses and victims of a crime. Variations of both these approaches can be found in U.S. cases.
