This principle is associated with processing crime scenes and is often summarized as "every contact leaves a trace?"

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The principle that every contact leaves a trace is known as Locard's Exchange Principle, named after French forensic scientist Edmond Locard. This principle emphasizes the idea that when two objects come into contact, there is always a transfer of material, and thus a trace of one object can be found on the other. This principle is fundamental to the collection and analysis of physical evidence at crime scenes.

This Principle Is Associated with Processing Crime Scenes and Is