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they found thumb prints in clay pots
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Erasistratus, created the first lie detector test when he noted that his patients' pulse rate appeared to increase when they lied.
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He looked at Julis Ceaser body and found out of the 23 stab wound only one was fatal.
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The first documentation of medical knowledge aimed at solving crimes was recorded in the book "Hsi Duan Yu" (the Washing Away of Wrong). It detailed the process of distinguishing drowning from strangulation.
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Investigators at Scotland Yard conducted bullet comparisons. Following these advancements, investigators developed successful tissue tests that identified arsenic murder.
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forensic science expanded to include technologies like body temperature to determine time of death
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Other critical discoveries of this time include voiceprint identification technologies, development of an acid phosphatase test for semen detection and early DNA analysis.