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Chinese publish first known book on forensic science being used in criminal cases.
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In England, a piece of newspaper in John Toms's pocket that matched a torn edge that was in a pistol was used to help put Toms away for murder.
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James Marsh had the first documented use of chemical testing, determining arsenic as the cause of death in a murder.
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San Fransisco is the first US city to begin using photos for IDing a criminal.
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Medical experts must be the ones to determine cause of death in crimes
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Fingerprints began to be used to determine a person's identity.