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They used fingerprints of clay tablets.
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The First lie detector was a Greek physician that found out that peoples heart beats went up when lying.
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People started finding clever ways to find weapons people used in murder.
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Bartolomeo da Varignana was the first human to do an autopsy.
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The First microscope was made.
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People started using temperatures of body's to figure out when they died.
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First started using fingerprints.
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The FBI Crime Lab is made.
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They started using dental records to figure out who the corpse is.
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A fingerprint scanner is made.
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DNA recognition is now a thing to find criminals.