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 to discriminate the difference between the two and come to a conclusion of whether it was or it was not zimmerman. and the only thing that you could achieve here, tom, is whether or not it was zimmerman.