Trayvon Martin's DNA Not Found On George Zimmerman Gun

In a finding that could refute George Zimmerman's self-defense claim, a law enforcement expert said that Trayvon Martin's DNA was not found on the grip of Zimmerman's gun.

Zimmerman pleaded not guilty to second-degree murder and says he shot the 17-year-old in the chest to protect himself as Martin reached for his firearm during a fight.

According to The Huffington Post, the Sanford, FL, watchman's DNA was not found under Martin's fingernails, but Florida Department of Law Enforcement DNA expert Anthony Gorgone testified Wednesday that Zimmerman's DNA was found among blood on a shirt the teen was wearing under his hooded sweatshirt.

Zimmerman's defense attorney Don West focused on the packaging of the DNA samples, while cross-examining Gorgone. The attorney suggested packaging could have led to the samples being degraded. But Gorgone told West that Martin's two sweatshirts had been packaged in plastic while wet, instead of a paper bag where they could dry out, and when he opened the samples they smelled of ammonia and mold.