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Nelson, i'm sure you heard about this, ruled that two voice identification experts will not be allowed to testify that that voice was trayvon martin. that seals the deal, in my view, ensuring that george zimmerman's acquittal will happen, even before the trial gets started. i think the defense wins this and the prosecution loses this. let's hear from two terrific experts that may see it differencely. that is faith jenkins on your right and former nypd detective, welcome both of you. so, faith i think here is a couple of obstacles. first of all, it was a merky circumstance, that was why zimmerm...

That night? like the 911 call we are about to play for you is from a neighbor and on the call you can hear someone screaming in the background. have a listen. >> does he look hurt to you? >> i can't see him. i don't want to go out there. i don't know what's going on. they're sending... >> ah. >> do you think he's yelling help? >> yes. >> all right. what is your -- >> that ended with the gunshot. >> look, this case is all about whether the man on the right was in self-defense acting when he shot trayvon or whether he was being far too aggressive in targeting that young man. whose voice was it s...

>>shepard: the question is who was yelling for help? well, now, two leading voice identification experts have analyzed the audio for the orlando sentinel newspaper and those experts have concluded that it is not george zimmerman screaming for help. finding out what a trayvon martin scream sounds like is impossible. in sanford, florida, this went down five weeks ago and we hear from the shooter's lawyer today. steve? >>reporter: the lawyers on both sides talking for george zimmerman his attorney says that if there is a warrant for george zimmerman's arrest there is no need for a manhunt, that g...

Will ask the justice department to look into how local authorities handled the investigation into the shooting death of their son. thousands gathered at the 17-year-old victim's home city of miami calling for an arrest of george zimmerman. zimmerman says he shot the unarmed teen in self-defense. but new questions are emerging about whose voice is heard screaming on the 911 tapes from the night of the shooting. >> do you think he's yelling help? >> yes. there's gunshots. >> two forensic voice identification experts tell "the orlando sentinel" that voice was not zimmerman's. reverend jesse jacks...

Patient. in the audio you can hear dispatchers saying a second ambulance was not needed to go to the scene and as you can hear rescue workers asking, they are asking for a medical helicopter for trayvon martin. >> contact air care and ask them to respond. >> we are on the line with air care. air care not available. >> in what could be one of the most important developments in the case, two forensic voice identification experts say the cry for help on the 911 call, on the night of the shooting, was not the voice of george zimmerman. joining me now are tom owen, forensics expert and chairman eme...