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And he falls off and like all right, you got it, you got it. inside of the courtroom, martin's parents listened to the record and this testimony without giving any reaction. but big witness testimony by trayvon's mother is yet to come and that is expected to be incredibly emotional when the prosecutors will put her on the stand and she will identify for the jury the screams were her jor. that was the prosecution questions of the fbi audio expert sometimes where there are screams, family members identifying the person screaming are more reliable than the scientific method. megyn. >> phil, thank...

>> there was no way that i could see that he could keep it out of evidence. what i find bizarre is why they called this audio expert in the morning to say that he couldn't tell whose voice it was. >> to say nothing. >> so what? >> right. >> why call a witness who can parade his ignorance before the jury. it just seems to me to raise more questions than it settles. when you're the prosecutor, you want to say to the jury this is a simple case, the facts point in this direction. if you're calling witnesses who say i don't know, why are you doing that? >> jeffrey, don't you think probably just for...

Phil. >> reporter: a strategic move by prosecutors, or jenna, rather, by prosecutors as they called one of the defense's audio expert witnesses first to then set up the still to come very emotional testimony anticipated by trayvon martin's mother. inside the courtroom right now sanford police detective doris singleton. she was involved in one . very first initial interviews with george zimmerman the night of the shooting. again today testimony addressing that infamous 911 call with somebody screaming in the background. stkpwhr-f >> 911 do you need police, fire or medical. >> maybe both i'm not...

To know about. also the privacy of the jurors after their verdict. on the stand is an fbi audio expert. this is a surprising call by the state. prior to the trial he was testifying on behalf of the defense that you cannot possibly determine who is the person screaming in the background in that 911 call. what the former fbi audio expert will be saying here is we are about to see. when the defense northern mark o'mara said zimmerman was not a hothead. in 2005 there was a battery of and the defense wants the judge

Day six of testimony in the george zimmerman trial. we continue to listen to one of the audio experts that's been brought for by the prosecution. lisa bloom is here with us. the percent cushion going for second degree murder, how does this all fit in going for what they're going for on the stand? >> one of the most important pieces in this case is the 911 call. when you hear the gun shot that rings out that took the life of young trayvon martin. the question is who is screaming on the call? experts can't answer that question. this man is an audio expert. he said people who knew these men would...