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Pioneered forensic toxicology
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Applied anthropometry to crime solving.
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Scientifically showed how fingerprints can be used to identify a person.
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Created the character of sherlock holmes and popularized forensics.
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Published questioned documents.
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Devised a method for discerning the blood types taken from blood samples from a crime scene
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Looked at the striations in a bullet to determine whether it was the one used to commit a crime.
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Formally established the basic scientific principle of forensics.