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more sophisticated methods to uncover the truth. also, zimmerman's two attorneys are speaking out about why neither sat down and looked their client in the eye. they spoke to local station, wofl. >> if there's an investigation on going in this case, there are cases where i want to hear my client's version, look him in the eye and see if i believe him or not. in this case, i believe the sanford police have already given him a voice stress test, he passed that. his statement seems to support the evidence what happened, i don't need to look him in the eye. >> all right. that's something...

and whether george zimmerman fired in self-defense. in a moment, a new version of that 911 audiotape that some believe contains zimmerman uttering a racial slur. the fbi now analyzing it. we did our own enhancements early but have now used more sophisticated methods to uncover the truth. also, zimmerman's two attorneys are speaking out about why neither sat down and looked their client in the eye. >> if there's an investigation on going in this case, there are cases where i want to hear my client's version, look him in the eye and see if i believe him or not. i believe the sanford ...

the evidence seem to support what he told us. i don't need to look him in the eye. >> sanford police won't comment on whether they put him through such a test when they questioned him but do say they use it as do other police departments. how reliable are they? we contacted an expert who did a study of the devices when used to question suspects about drug use. he says their ability to detect deception is, i'm quoting now, no better than flipping a coin. again, we don't know whether the sanford police department subjected zimmerman to such a test nor if they used it as a basis for not...

Courtroom, not by police department or a state attorney saying, you know, he said self-defense so we are going to let him go free while trayvon goes to the medical examiner. that's the tough thing to the deal with for his mother and father. >> sybrina fulton, a mother knows her child's voice. you have said from the start that that was trayvon on that 911 tape that we hear crying, screaming for help during this incident. we just presented two audio experts who insist to their 99% certainly, legal certainly that that voice is not robert zimmerman. there's only one other voice that it can be on t...

He is said he was outraged by the family's request. sanford police chief sided with him even though the lead investigator did not believe george zimmerman's story. two audio experts have now said the cries for help on the 911 tapes are not that of george zimmerman. one expert said the test concluded that it's not the voice of george zimmerman. abc news reports and has now enhanced the police surveillance vid you of george zimmerman. in the enhanced video there's mark on zimmerman's head which might be an injury but the video does not show evidence of an injured nose or any signs of blood on hi...