George Zimmerman arrives in Seminole circuit court with his attorney, Mark O'Mara, left, in Sanford, Fla., for a pre-trial hearing Friday, June 7, 2013. Circuit Judge Debra Nelson is listening Friday to testimony from voice experts about whether witnesses with expertise in speech identification should be allowed to testify when Zimmerman's trial starts next week.  (AP Photo/Orlando Sentinel, Joe Burbank, Pool)
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