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Arabic merchants take a debtors fingerprints and attach it to a bill.
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First recorded instance of physical evidence leading to a murder conviction. The evidence was a torn piece of newspaper that matched the news paper in his pocket.
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San Francisco used photography for identification. They were the first to do so.
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Victor Balthazard and Marcelle Lambert publish their first study on hair. The first legal case ever involving hair took place in the study.
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Prototype polygraph was developed for use in police stations
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Michigan State University develops a system that matches police sketches with mug shots in the police system.