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Teeth were looked at and compared to dental records to determine who the victim was.
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Teeth starting to be used to identify victims.
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Bullet comparisons were made so killers could be caught.
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Bullets were compared to catch a killer.
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The temperatures of bodies are used to determine the time of passing.
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Photography was starting to be used to identify items or surroundings at a crime scene or criminals.
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Fingerprints were now being used as police started to get fingerprints from criminals.
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Criminals that get arrested are now being fingerprinted.
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The Polygraph was invented.
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The invention of breathalyzer test was invented.
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DNA started being used to catch criminals.