Big Win for Zimmerman: No Audio Experts at Trial One identified a voice screaming for help on 911 call as Trayvon Martin's By John Johnson, Newser Staff Posted Jun 22, 2013 10:31 AM CDT 237 comments Comments George Zimmerman looks at a laptop during jury selection last week. (AP Photo/Orlando Sentinel, Gary Green, Pool) (Newser) – George Zimmerman got great news for his murder defense today: A judge ruled that two audio experts who could have been detrimental to his case won't be allowed to testify, reports the Orlando Sentinel. The experts analyzed screams for help that could be heard in the background of a 911 call; one thought it was Trayvon Martin and the other stopped short of that but ruled out Zimmerman's as the voice. Prosecutors obviously wanted the jury to hear that Trayvon was calling for Zimmerman to stop, but the defense convinced the judge that voice analysis was too inexact of a science, reports USA Today. The all-female jury will start hearing opening arguments on Monday.