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Fingerprints casted in clay would be used to determine suspects.
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The book Hsi Duan Yu was created to help determine the cause of a crime.
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Mathieu Bonaventure Orfila is considered to be the father of toxicology and used this knowledge to determine if poisons were used in the crime.
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The temperature of bodies would be used to determine the time of death which would help narrow down the suspect.
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The Polygraph Machine was used to determine heartrate and stress levels to determine if someone was lying.
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Test were conducted to determine gunshot residue which could help determine where and how someone shot the gun.
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The use of DNA and computer forensics allows scientist and Forensic teams to determine cause of death, how the victim might have died and even can help determine suspects.