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Suffered a potential blow to its case when the judge barred testimony from audio experts who claimed trayvon martin can be heard screaming on a 911 call moments before he was fatally shot. judge debra nelson said the methods used to identify the voices on the kaurl are not reliable. however, she will allow the 911 recording to be played during the trial, opening the door for witnesses to identify the person crying for help. zimmerman is charged with second-degree murder. hes pleading not guilty,...