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In 1835 the first case where bullet comparison was used.
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Body temperature was starting to be used to estimate how long a person had been dead for.
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Period: to
The first use of photos to identify criminals was used in the 1880's.
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The first fingerprinting identification methods were used in 1903.
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In 1921 the polygraph was invented by John Augustus Larson and James Mackenzie
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In 1986, DNA had started to be used in identifying criminals.