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  A German scientist discovered a way to detect poison in a victim's stomach lining.
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  Impressions of shoes and clothing could now be used to catch murderers
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  Chemicals are now used to detect other chemicals used in a murder.
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  Fingerprinting was used to record people in case they did something illegal
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  This test was created to differ human blood from animal blood.
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  This was able to differ individuals from eachother, and catch a criminal.
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  Detection techniques are improved and continued with technology.