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>> bill: this in the impact segment tonight, the latest in the george zimmerman murder trial as you may know trayvon martin's mother testified it was her teenage son screaming for help on the 911 call. but today the lead police investigator in the case told the jury that trayvon's father said it wasn't his son on the tape. also, a variety of zimmerman supporters said it was the accused murder irer who was crying for help, a mess, right? finally the judge has ruled that the jury can hear about traces of marijuana being in trayvon martin's system at the time of his death. joining us now from was...

The stand and they both said that they had played that 911 call, the one with the screams, and that the detectives had heard tracy martin tell them when they asked, was that your son screaming, he said no. but when tracy martin was questioned on the stand, he said, in fact, what he said was that he couldn't tell. the prosecution got up quickly and began to cross-examine and sort of support tracy martin. listen. >> in terms of what was going through your mind, can you describe to your jury what was going through your mind when you were listening to that? >> basically what i was listening to, i ...

Is that a normal thing that people -- or do people just react, oh, okay, no big deal? >> it's extreme grief. so yes, that is typical. >> and the word "no" is like i can't believe it, like he's dead. isn't that a normal thing? >> that would be speculation. >> it's based upon what his experience has been. so in that regard, i'll allow it. >> right? it's normal for when you're telling them about the death of a loved one, people say no, you know, like i can't believe it, that kind of stuff? >> it could be construed as denial. yes, sir. >> right? and that would be a normal thing based on your exper...

The struggle. trayvon mart tans mother and zimmerman's mother say it was their son screaming in the background. >> he keeps yelling help? >> screaming or yelling. do you recognize that? >> yes. >> who do you recognize that wilto be? >> trayvon benjamin martin. >> who's voice was that? >> my son george. >> are you certain of that? >> because he's my son. >> a medical examiner also testified that martin was shot through the heart and may have lived up to 10 minutes after the altercation. prosecutors rested their case and the defense asked the judge to dismiss the trial but she refused. zimmerman...

Put on their presentation of their case. msnbc legal analyst lisa bloom and criminal defense attorney john burress are with me. lisa, i want to get your take on this out of the gate. they were very specific with serino about back to the 911 tape and the voice and the fact zimmerman said that doesn't sound like me. >> there was so much more i would like to hear from chris serino. it's all about the father of trayvon martin, who initially said it didn't sound like his son screaming on the 911 call. chris serino had to admit that tracy martin said, not my son, in a very emotional moment because h...