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The parents of george zimmerman. you don't see george zimmerman's parents, they were not allowed in court. they'll be witness. their testimony cannot be tent aed not so for the victim's parents both in the courtroom. i want to bring in our cnn analyst. mark, this is such a critical moment, because we had heard for a year those harrowing screams and i am a mother, you are a father, look, i could tell you definitively, i could recognize my children's screams. in the supermarket last weekend, i turned my head when someone else's child was screaming and thought it was my own. >> those are your mat...

Also, there is no methodology, no science to determine who is screaming on a tape like this. here's the thing, when the prosecution asks dr. nakosone, is it familiar for someone familiar with that voice to make that determination? he said yes. we heard from our legal analyst perhaps that can open the door for lay witnesses to come in like trayvon martin's parents to come in and say, hey, that's the voice of my son, possible. when we saw cross examination, we saw the defense go back to dr. nakasonement they questioned and made sure the jury is aware, number one, there is no science to determine...

Those 911 calls, told the operator that he was pursuing him, he was following him, even though the operator told him to turn around and that is not his job, to back away, then got into some sort of confrontation, a shot was fired and a 17-year-old was shot and killed. >> kerry, one more thing. it's my understanding that because we don't have trayvon martin's voice recorded somewhere, you can't say not only is this not george zimmerman's voice but you cannot conclusively say that it is the screaming voice of trayvon martin. >> reporter: exactly. because, remember, this is an analysis where they...