Expert: No Martin DNA on gun grip

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Expert: No Martin DNA on gun grip

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Expert: No Martin DNA on gun grip

WPVI – Philadelphia 0:46 mins

Trayvon Martin's DNA was not found on the grip of George Zimmerman's gun, and Zimmerman's DNA was not found under the unarmed teen's fingernails, a law enforcement expert said Wednesday in testimony that prosecutors hope will refute the neighborhood watch volunteer's self-defense claim.

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