Federal Bureau of Investigation (FBI) agents investigate cases through scientific methods in the United States. The agents work on the methods of crime detection. They use scientific methods for the detection of crime. Experimental detection of crime. A dummy on the ground. The agents pick up murderer's weapons and other equipment. They also pick up a drinking glasses for finger prints. The murderer's weapons are never touched by hands so that the fingerprints of the murderer can be detected. 'Technical Laboratory Federal Bureau of Investigation' written outside a cabin. A man works in the laboratory and tests samples. A pistol placed on a table. The man views the fingerprints on the pistol through a magnifying glass. He also tests the fingerprints on the glass. Men view the fingerprints on a projector. A man tests the foot print samples to investigate the case. They make and test models of the rifle, footprints, palm and face.

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