Tests find only Zimmerman's DNA on pistol

ORLANDO, Fla. -- Forensic tests made public by prosecutors yesterday show that only George Zimmerman's DNA could be identified on the grip of the gun used to fatally shoot 17-year-old Trayvon Martin.

The results rule out Martin's DNA from being on the gun's grip.

Zimmerman's DNA also was identified on the gun's holster, but no determination could be made as to whether it had Martin's DNA also, the Florida Department of Law Enforcement reported.

Zimmerman is charged with second-degree murder in Martin's death after their confrontation in a gated community in Sanford in February. He has pleaded not guilty on grounds of self-defense.

The question of whose DNA is on the gun and holster could play a role in Zimmerman's defense.

Zimmerman says Martin had been on top of him, slamming his head against the ground and smothering his mouth and nose with his hand and arm.

Zimmerman said he grabbed his gun from a holster on his waist before Martin could get it and shot the teenager once in the chest.

Other documents released by prosecutors include an interview with the clerk of a convenience store where Martin bought Skittles and a can of iced tea moments before his confrontation with Zimmerman.

The clerk said in the interview, more than a month after Martin was shot, that he didn't remember him. "To be honest, I don't even remember that day," said the clerk, whose name was redacted from the audio interview.

Prosecutors also released hundreds of emails sent to then-Sanford Police Chief Bill Lee, whose department faced a storm of criticism when Zimmerman wasn't arrested immediately. Lee was fired in June.