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Many years giving that context. yes, sometimes you can identify the difference between a younger sounding voice and older voice. he has done it before. it's making a little more sense. it's becoming much clearer. i suspect that's where it's going. >> also he also testified when a grown man is afraid, he sounds like a younger person. >> that's right. he says that pitch sometimes gets much higher when under stress but again, if trayvon martin was already young, his voice hadn't been established yet, if he's under stress then you're listening to a higher pitch and you have other witnesses that ar...

Specifically if you can tell if the voice is an old voice or a young voice. let's listen. >> we know people make mistakes. when we hear someone say a young's voice coming through. 20 years old probably but it can turn out to be 55-year-old talking or sometime a judge. i think everybody may have gone through this before too. you may think this man is very old, maybe 30, 35 but he can turn out to be only 18 or 19. this also depends upon the

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.

Latest updates on this topic from reliable sources.

Latest updates on this topic from reliable sources.