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In 1989 they started to use more of the FBI and get into investigations.
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in 1932 the FBI and other agencies created a lab for detections.
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In 1864 they began taking pictures of the crime scene so they can go and look back at what happened for more clues.
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They started to tell when the victims started to pass away depending on the temperature of the body.
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They started to detect the weapons used by the bullets found. When they would find a bullet in a crime investigation they would compare depending on the weapon.
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Objects began to be weighed by the volume or size they were.
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The scientists made there first Lie detector. The lie detector detects whether a person is wrong or right.
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In 1839 they got a way to detect sperm in people for cases.
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