Turning Unknowns Into Knowns - Linking Cartridge Cases to the Firearms and Suspects to Crime Scenes

This article was reprinted with permission from the Polaroid Corporation’s “Instant Evidence” photography newsletter for law enforcement officials, Spring 1993, Volume IV. It details how the Los Angeles Police Department Scientific Investigation Division tries to connect cases by taking images of firearm cartridge cases and posting and comparing the images on two hallway walls.

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