airasia didn t go to the proper authorities to say can i rearrange the flight schedule? i know that s part of the ongoing investigation. david molko, thank you so much. the search takes on new urgency, of course, with each passing day. much of the focus now turns to locating the plane s black boxes by chasing down the tiny signals from the so-called pingers. and because they are battery powered, those signals are likely to just disappear few n fewer than three weeks. jeff wise is a cnn aviation analyst and paul ginsburg is an audio analyst who has worked with the fbi and cia. paul do you have any concerns that maybe those pingers didn t even activate? well these pingers are different from the emergency locater transmitters that are designed to activate on impact. the pinger activates by water. it s a water switch.
there drawing on his experience as a combat medic remembering what it was like to hear screaming, to hear people yelling for a medic. he says that when he played that audio tape he knew right off the start that was george zimmerman. all of this goes back to what we heard from the audio analyst. that audio analyst just last week when he said that a person could identify that voice if it was a family member, a close friend but that person would also have had to heard the voice in a similar circumstance, a similar scenario. in this particular case where you have a combat medic testifying, he says without a doubt that the voice was george zimmerman. then george, my gosh, a combat medic in vietnam gets up on the stand. he s the first person to wipe his eyes and show some tears when identifying that voice. we ve had two mothers saying it was their sons and yet no tears which has been really remarkable. stand by. after the break we ll find out
specifically that it would be a family member who would best determine who was screaming on that tape. however, he made the point that it would have to be in the same situation. a similar scenario, the same type of scream. that question was posed to jahvaris fulton and he said he heard him yell, not like that, but, yes. so, he did answer that question. the same issue that was brought up by that audio analyst. you would hope he wouldn t hear his brother yelling, if, indeed, it was trayvon martin s voice on that tape. there was a gun involved in the tussle, right? he was screaming in terror. you wouldn t hear your brother screaming like that normal, everyday life. right. that s very important because what the defense is doing, they are trying to look at any inconsistency or difference in the story that he gave in court as opposed to what he told the reporter and also trying to figure out if he heard a similar type of scream. and, page, actually when
serino to do a re-enactment. he conducted another interview. in the first statement, zimmerman talked about trayvon martin jumping out of bushes to ambush him. in the re-enactment, he didn t say that. did you notice anything to bring to the jury s attention today that caused you concern? not that i can articulate, no, sir. there was the testimony from a doctor, an fbi audio analyst called to the stand by prosecutors. his focus, the 911 call. it s not possible to determine age or analyze the tape through science, he left one possibility wide open. for this particular case, the best approach to be would be
rather he seemed to be effected by the fact that he realized that trayvon martin had passed? he seemed affected by that. reporter: one day after the shooting, and george zimmerman returned to this neighborhood with lead investigator chris serino to do a video reenactment. serino later conducted a more aggressive interview, challenging zimmerman on some points. for instance, in the first statement zimmerman talked about trayvon martin jumping out of bushes to ambush him. in the reenactment, he didn t mention that, but in court, serino s final analysis did you notice anything to bring to the jury s attention today that caused you that concern? nothing i can articulate, no, sir. reporter: there was also the testimony from the doctor, an fbi audio analyst for the defense who was called to the stand by prosecutors. his focus, the 911 call where you can hear screaming in the