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Erasistratus discovers that people's hearts beat faster when they are lying.
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The first microscope is developed.
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Henry Goddard catches a murderer using bullet comparison.
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Taylor and Wilkes write a paper that explained how one could determine one's death based on body temperature.
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First use of identifying criminals & documenting evidence + crime scenes.
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Henry Faulds publishes an article saying fingerprints could be used to identify a criminal.
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Karl Landsteiner discovers different blood groups.
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Fredrich Miescher's breakthrough involves the discovery of different DNA strands, with Alec Jeffreys soon after making the first DNA test.