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. >> we're going to take you live back to the courtroom in sanford, florida, where defense attorney don west is now questioning this witness, dr. nakasone. something has just been introduced into evidence. i'm not sure what it is. let's listen and determine. >> there is a consensus to certain kind of voice samples that are suitable for forensic analysis. >> that is correct. >> so your decision in this case wasn't based solely on your personal view about what samples are reliable or suitable and which ones aren't? >> i strongly belief my opinion is supported by my colleagues in the scientific c...

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...

Exposing the other examiners would have judgment made by the preliminary examiner would guarantee bias. so the examiner is elaborately trained not to produce any potential bias. >> it's -- i take it, it's well recognized that there can be that bias that someone who listens to something at the same time someone else is may be influenced by the impression or the opinion of the person sitting next to them. >> there is always danger of biasing others. >> and in your setting, you would not tolerate that? >> that is correct. >> that's not just good laboratory practice, i take it. that would also be ...

Not? >> that is true. i have analyzed voice coming from 16-year-old young men against 20-year-old men on a case. we were able to identify the voice and in other cases more often than not we not recommend to police department or field office, do not try to get voice samples from younger boy who are going through potential voice change. this puts a very special uniqueness in situation because depending upon individuals, one person goes through and complete his voice change in rather short period of time. he may start at 12. he may complete his voice change within a year.

Their own opinions. there's also been a hearing. the judge has been hearing testimony about the screaming 911 calls. what came of that hearing yesterday? >> reporter: it was a death cry. someone knew they were going to be killed and the question is who was it. was it george zimmerman? was it trayvon martin? they haven't reached a conclusion yet. there's going to be another expert witness to take the stand tomorrow for the prosecution. it's the prosecution that wants expert testimony on this. there are no conclusions though. the experts just tend to think it's trayvon martin because of the high...