Photo: Animal DNA Becoming Crucial CSI Clue

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A staff researcher at the Veterinary Genetics Lab in Davis, California, swabs a spot of saliva off a sweatshirt worn by a victim in a 2002 dog attack. The lab's technicians retrieve animal DNA from urine, saliva, feces, dead skin, and dander for use in criminal investigations.

Photograph by Eric Risberg/AP

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