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The standard operating procedures and when the speech is determined to be natural we would check the other aspects of conditions. for example, the duration must be at least 30 seconds after blank was removed. usually we can do meaningful analysis if the voice sample is 30 seconds, one minute, maybe up to three minutes or so. after three minutes the performance hits the ceiling. when the speech sample drops down to 14 seconds the examiner has to conclude the voice is -- the duration is not good enough for analysis and then we will also check the amount of

Trial. >> right. the frye hearings, we spent weeks. i don't know if this was a trick by the prosecution. i don't know why the defense didn't object. this should be very interesting. i wonder what he's going to talk about. >> let's talk to mr. defense attorney. >> the judge said you can't have an expert testify to that question of whose voice is it we heard making the scream. maybe there are other things about that tape an expert can shed light. what i thought was interesting is the defense said let's bring him up. they seem excited about this testimony. >> the defense testimony said i'm eager ...

Sure the speech sample we have at hand is naturally spoken. it would be devoid of disguised attempt. any evidence of intoxication. they must be removed for analysis. and also we pay attention to the emotional state of this speech. if the person is uttering voice samples, with extreme happiness, the voice would be joyous, including lots of giggling and laughter. those must be removed from the analysis. sometimes we run into the voice being uttered when the person is going through stress, or undue depression. this must also be removed. and any other unnatural voicing, like yelling, screaming, th...

And they called a for ren sec scientist. according to the doctor of the 45 seconds of the 911 tape he examined only a few seconds were clear enough to tell anything about who is screaming. >> there was say a three second long screaming voice that we determined that screaming was not normal. it was pretty much uttered by someone who was facing probably imminent threat of death or something. >> the doctor was the only witness on the topic today. prosecutors want to play the tape in open court and then call experts to show it was martin screaming for mercy so they say. but when they pressed the d...