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Their head when they speak. when they hear themselves recorded it doesn't sound like that. if you hear yourself screaming for your life, it's certainly going to be different. >> i'm not sure i would recognize anybody screaming in a way we heard on that tape. >> i'm with you 100%. >> that is why no voice expert has been able to definitively say. >> it's different. people who can identify your voice are identifying it from their own personal experience and hearing it. the voice experts are using a computer program. they're comparing it to a sample. there is no sample of george zimmerman screamin...

On a record something if you listen to your own voice, does it always sound like the way you expect you sound? most people hear their voice in their head when they speak. when they hear themselves recorded it doesn't sound like that. if you hear yourself screaming for your life, it's certainly going to be different. >> i'm not sure i would recognize anybody screaming in a way we heard on that tape. >> i'm with you 100%. >> that is why no voice expert has been able to definitively say. >> it's different. people who can identify your voice are identifying it from their own personal experience an...

Doesn't sound like me. >> have you ever heard yourself on a record something if you listen to your own voice, does it always sound like the way you expect you sound? most people hear their voice in their head when they speak. when they hear themselves recorded it doesn't sound like that. if you hear yourself screaming for your life, it's certainly going to be different. >> i'm not sure i would recognize anybody screaming in a way we heard on that tape. >> i'm with you 100%. >> that is why no voice expert has been able to definitively say. >> it's different. people who can identify your voice a...

Little bit of an emotional move there. right at the end of the prosecution's case in chief. what did you think? >> i think as you said, it was absolutely necessary, and it is a good piece of evidence. if anybody can identify the voice on that tape it is his mother. but the reality is, of course, it cuts both ways, because she, of course, is going to want to hear his voice, so her testimony is somewhat junior mined. one additional point that came out of testimony, to put this into context to remind the jurors, just what is going on here. a young man lost his life and that's terrible. >> it is. ...

There. right at the end of the prosecution's case in chief. what did you think? >> i think as you said, it was absolutely necessary, and it is a good piece of evidence. if anybody can identify the voice on that tape it is his mother. but the reality is, of course, it cuts both ways, because she, of course, is going to want to hear his voice, so her testimony is somewhat junior mined. one additional point that came out of testimony, to put this into context to remind the jurors, just what is going on here. a young man lost his life and that's terrible. >> it is. that's tragic and the defense ha...