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Of recorded evidence and ed -- an audio engineer and forensics expert. first tom, to you, tell me what you established and how you established it with these audiotapes. >> well, lawrence, i attempted to do a comparison of a known voice being zimmerman and an unknown voice being the person who was screaming. i manipulated the tapes in such a way where i took out everyone else, in other words the 911 controller, the background noise, anybody else or any other noises other than the voice itself. then i compared the two together in a biometric program called easy voice biometrics and that was able...

You don't have a way of determining whether it was trayvon martin. >> that's correct. i had no samples of trayvon martin's voice to compare against. >> you need to compare audio to audio. what ed, what method did you reach to if come to the same conclusion. >> i listened to the 911 recordings and listened critical listening skills that i have developed over the last 28 years of my career. the voice is like a symphony and used my skills to determine what i have already declared. >> ed, you are using an old-fashioned piano tuner's method, the human ear, highly tuned and trained for distinctions....

Methodologistology in the state of connecticut. a murder trial involving a 911 call. >> and ed, what is your level of satisfaction with your finding? are you 99% certain, 70% certain? >> i'm in the 90s lawrence. i would love to have an exact kpamp lar of mr. zimmerman's voice to compare to those screams and i could come up with some stein tisk evidence to prove whether it is or is not his voice at that point. >> let me go to the other controversial element of the tape, of what zimmerman's own 911 call, where he uses potentially a racial slur. some people hear it. some people don't. ed, first y...