Forensic tests 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 made public Wednesday rule out Martin's DNA from being on the gun's grip. Zimmerman's DNA also was identified on the gun's holster. The tests were inconclusive as to whether Martin's DNA was on the gun's holster.
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.
Zimmerman says Martin was on top of him, slamming his head against the ground when he grabbed his gun from a holster before Martin could get it.
The delay in Zimmerman's arrest led to nationwide protests.
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