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Became chemistry professor and experimented with poisons.
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Developed ID system called Anthropometry which consisted of different body measurements.
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Published book Discussing three types of fingerprints discovered, loop, whorl, and arch
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Author of Sherlock Holmes, and wrote about different methods of forensics before they were used.
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First American to utilize the scientific method in the examination of questioned documents.
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Developed criminalistics through crime scenes and worked with Alphonse Bertillon.
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Discovered the different blood types to help identify criminals.
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Used ballistics in crime famous for Valentines Day massacre.