George Zimmerman listens to state witness Dr. Hirotaka Nakasone, a senior voice recognition scientist with the FBI, during the 16th day of his trial in Seminole circuit court, in Sanford, Fla., Monday, July 1, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)

Associated Press
George Zimmerman listens to state witness Dr. Hirotaka Nakasone, a senior voice recognition scientist with the FBI, during the 16th day of his trial in Seminole circuit court, in Sanford, Fla., Monday, July 1, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
George Zimmerman listens to state witness Dr. Hirotaka Nakasone, a senior voice recognition scientist with the FBI, during the 16th day of his trial in Seminole circuit court, in Sanford, Fla., Monday, July 1, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
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