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>> a judge will real whether an expert can testify on a crucial piece of evidence. who is screaming on the 911 tape, tell us about it? >> this is probably the most important piece of evidence in this trial. you hear a voice. it has been described as a death cry, somebody believing they're going to die. prosecutors want to put expert testimony on to say they can't conclusively say, they say based on the science it is trayvon martin t. defense put on really renowned experts saying there is no credibility in these experts and the voice at all t. voice is so far away t. instruments and spectro gra...

Prosecutors want to put expert testimony on to say they can't conclusively say, they say based on the science it is trayvon martin t. defense put on really renowned experts saying there is no credibility in these experts and the voice at all t. voice is so far away t. instruments and spectro graph they are useing is outdated.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 doper with mark geragos and joining me is marcia clark, author of "killer ambition." marcia, you say you ...

Infiltrate the afghany police to attack us inside. >> gretchen: there were another two deaths over the weekend. they are not even going on patrol because the danger is too high. there is a lot of chaos. even though you listen to the president. he stix to his greatest achievement which is taking out osama bin laden. you have to dig doper . check out the wall street journey . mitt romney wrote about the president's foreign policy and how he would differ if he were in charge. here is a snippet. president obama has allowed our leadership to atropy and our economy is stuck in a rivery military faci...