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Conclusively say but they believe based on the science that it is trayvon martin. defense put on really renowned experts saying there is no credibility in these experts and the science at all. the voice is so far away, the instruments they are using are outdated and there is just no way to tell with any type of scientific certainty who was crying out. >> i interviewed trayvon martin's mother and she said she was pretty sure that was her son's voice. >> that's right. >> let's dig deeper with the criminal defense attorney and marsha clark former district attorney and author of killer ambition. s...

Prosecutors want to put expert testimony on to say they can't conclusively say, they say based on the science it is trayvon martin. defense put on a really renowned expert saying there is no credibility in these experts and the voice at all. the voice is so far away. the instruments and speck tro graph they are using is outdated. there is no way to tell with any kind of scientific certainty. >> trayvon's mother said she was sure it was her son's voice. jean, we appreciate the update. let's dig deeper with mark geragos and joining me is marcia clark, author of "killer ambition." marcia, you say...

Ashleigh, i was in the courtroom, and i said this is an all female jury. 5 of the 6 are mothers. though this is a case of trayvon martin against george zimmerman, mothers are going to be sitting in the courtroom. >> talk to me about this frye hearing. a love the way you boil down complex legal terms and make them make sense. has do with analyzing a 911 call to try to determine whose voice it is screaming for help. and the frye hearing, i think either has come to an end or should be coming to an end, should determine the science of determining that. why is it significant? >> exactly. exactly. i...

On these key issues from some of the language that can and cannot be used of the 911 call where screams could be heard in the background? >> well, they're trying here, tamron, which is all about bringing in voice experts into the trial and once it gets underway they'll hear testimony. we expect they'll hear that this afternoon. she wants to get to that and rule on that before the start of opening statements. so as far as the motion by the defense to prohibit the state from using certain phrases and words, nothing has been filed with the court. at last check there was nothing filed with the cou...

>> reporter: let me set the stage very quickly for you, erin. a couple of weeks ago james holmes was in court and expected to enter a plea. he said i'm not ready. we will not enter a plea. the judge entered a plea for them of not guilty. monday the prosecution in the hearing right behind me here will announce whether they're going for the death penalty or not. so yesterday the defense put out a document saying that we are ready to accept an offer that takes the death penalty off the table. so many of us read that and we thought something's cooking here. we could have an -- we could have a deal...