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In 1835, a comparison with the bullets was used to find a killer.
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In 1863 the body temperature was used to determine the person's time of death. The sooner the body is found after death, this method will be able to assess the more accurately the time of death. All bets are off once the body reaches ambient temperature. But the determination of body temperature is subject to several sources of inaccuracy, even if done correctly and soon after death.
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The use of photography for the identification of criminals and evidence and crime scenes documentation was in the 1880s.
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The State Prisons of New York adopted the use of fingerprints in 1903
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In 1921 John Larson invented the Modern polygraph.
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Breathalyzers were first invented back in 1954. Its use was to prevent harm from drunken-driving incidents.
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From the 1980s onwards, scientific advances authorized the use of DNA as a material for an individual's identification. Dr. Jeffrey Glassberg filed the first patent covering the direct use of DNA variation for forensics in 1983
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