The theory that a criminal perpetrator leaves part of himself at the scene of a crime, and takes a piece of the crime site with him, was postulated in 1911 by Dr. Edmund Locard in Lyon, France. Referred to as the Locard Exchange Principle, this concept, along with the idea of interpreting physical evidence to reconstruct what took place at the site of a criminal act, is the basic rationale behind crime scene investigation. The term "associative evidence" describes items that, pursuant to the Locard Principle, can connect a suspect to the scene of a crime.
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