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Self defense to save his own life. now, the defense played a 911 call from a neighbor in which you can hear screams in the background. audio experts that analyzed the call say the screams are not coming from zimmerman, but the judge, deborah nelson ruled the experts cannot testify. she says there's no evidence their techniques are generally accepted. there's no real validity to them. going to speak with one of those so-called experts in a moment, you're going to hear from him, you can determine for yourself how you feel about it. here is some of the neighbor's 911 call, trayvon martin's mother...

In court today, george zimmerman's defense says it was trayvon martin who decided to confront zimmerman and that zimmerman was forced to act in self defense to save his own life. now, the defense played a 911 call from a neighbor in which you can hear screams in the background. audio experts that analyzed the call say the screams are not coming from zimmerman, but the judge, deborah nelson ruled the experts cannot testify. she says there's no evidence their techniques are generally accepted. there's no real validity to them. going to speak with one of those so-called experts in a moment, you'r...

>> reporter: prosecutors may call on witnesses who claim it was trayvon martin screaming for help. over the weekend, the judge denied the testimony of the audio experts. cnn legal analyst called it a setback. >> it was a major corner stone of their entire case. from the beginning, we are saying whoever's voice it was crying for help showed that the other person was the perpetrator. >> the jury was sworn in last week. a panel of all women. five who attorneys say are white. one is black/hispanic. their identities kept anonymous to protect their privacy. george howl, cnn, florida. former mob bo...

Zimmerman was the aggressor. they'll argue that he profiled and continued to pursue trayvon martin even after a dispatcher told him not to. there's also the question of who was screaming for help on this 911 tape moments before the fatal shot. >> do you think he's yelling help? >> yes. >> all right, what is your -- >> reporter: prosecutors may also call on witnesses who claim it was trayvon martin screaming for help. but over the weekend, judge deborah nelson denied the testimony of the state's audio experts. cnn legal analyst called it a setback for prosecutors. >> their audio expert was one ...

Zimmerman acted in self-defense the night in february of 2012. they need to show that zimmerman was in a fight for his life the night he admitted to shooting and killing tray von martin. john guy will open for the state. prosecutors must prove that zimmerman was the aggressor. they'll argue he profiled and continued to pursue trayvon martin even after a dispatcher told him not to. >> okay, we don't need to do that. >> reporter: there's also the question of who was screaming for help on this 911 tape moments before the fatal shot. >> you think he's yelling help? is >> yes. >> what is your -- [ ...