Only DNA from George Zimmerman was found on the grip of the gun that was used in the fatal shooting of unarmed teenager Trayvon Martin, according to DNA test results released Wednesday. 
 
 The test results were in the latest batch of discovery material released by officials in the notorious murder case, which has become a national flashpoint in race relations and gun laws. Zimmerman, 28, is free on bail awaiting trial on charges of second-degree murder in the killing of Martin, an African American teenager, who was shot to death in a confrontation at a gated community in Sanford, Fla., on Feb. 26. 
 
 The tests on the gun and the holster were performed by the Florida Department of Law Enforcement. They found Zimmerman’s DNA on the gun but could not find any of Martin's. No determination could be made as to whether Martin's DNA was on the holster. 
 
 PHOTOS: Tense moments from Trayvon Martin case 
 
 Zimmerman has acknowledged shooting Martin, but insists he acted in self-defense in the wake of a confrontation that left him injured. 
 
 The DNA findings could play a role in the trial, allowing the prosecution to argue against self-defense since it now seems that Martin never touched the weapon. The defense could counter that Zimmerman shot before Martin could get to the gun. 
 
 Zimmerman was not arrested the night of the shooting. After weeks of protests about that fact, a special prosecutor charged Zimmerman, a neighborhood watch volunteer, with second-degree murder. 
 
 Among other material released Wednesday was an interview with a clerk of the convenience store where Martin had gone to buy a package of Skittles and a can of iced tea. Martin was returning from the store when the confrontation with Zimmerman took place. The unidentified clerk told authorities he had no recollection of serving Martin. 
 
 “To be honest, I don't even remember that day,” he said. 
 
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 Father-daughter dances banned in R.I. as 'gender discrimination ||||| Forensic tests made public Wednesday show that George Zimmerman's was the only DNA that 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 Martin's DNA was on the gun's holster, according to the report from the Florida Department of Law Enforcement. 
 
 Zimmerman is charged with second-degree murder for fatally shooting Martin during a confrontation in a gated community in Sanford in February. Zimmerman is pleading not guilty, claiming self-defense. 
 
 A delay in Zimmerman's arrest led to nationwide protests. 
 
 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 when he grabbed his gun from a holster on his waist before Martin could get it. He shot the teenager once in the chest. 
 
 Other documents released by prosecutors Wednesday include an interview with the clerk of a convenience store where Martin purchased 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 Martin. 
 
 "To be honest, I don't even remember that day," said the clerk, whose name was redacted from the audio interview. 
 
 ___ 
 
 Associated Press writers Kyle Hightower in Orlando and Terry Spencer in Miami contributed to this report.
– Only George Zimmerman's DNA was found on the gun used to kill Trayvon Martin, according to test results revealed today. The findings could undermine George Zimmerman's self defense claims, the LA Times reports. Zimmerman reportedly originally told police that Martin went for the gun. The tests prove that Martin's DNA never touched the gun's grip, but were inconclusive as to whether it may have touched the holster, according to the AP.