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 police have given him a voice stress test and he s passed that. so i don t necessarily need to look him in the eye. all right. that s something new, george zimmerman taking a voice stress test. sanford police won t comment on whether they put him through such a test when they questioned him, but they do say they use it as do other florida police departments. keeping them honest though, how reliab