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By the defense. like many of the witnesses monday he testified about the screams on that 911 tape and for the defense a chance to introduce the presence of a controlled substance in trayvon martin's blood. cnn's george howell is live in sanford, florida, with more on this. good morning, george. >> reporter: kate, good morning. so we now know that this jury will hear about marijuana levels that were in trayvon martin's system. this, after a list of what seemed to be character witnesses who testified that it was george zimmerman screaming for help. the defense put trayvon martin's own father on ...

Witnesses. here is george howell. >> reporter: one after another after another, defense witnesses hammered home the same answer when asked who was screaming on this 911 call. >> help! >> you think he's yelling help? >> yes. >> what is your -- >> do you know whose voice that is in the background screaming? >> yes, definitely. it's georgie. >> i thought it was george. >> when i heard the tape, my immediate reaction was he was screaming for help. >> whose voice is it? >> george zimmerman's voice. >> there's no doubt in my mind that was george zimmerman. i wish to god i didn't have that ability to...

>> okay. >> and he and another agent came to my house and interviewed me. >> and you gave them a state about whatever information they asked you about, i presume? >> that is correct. >> okay. at some point did you have an opportunity to listen to what we call and have been calling during this trial the lauer 911 tape? and for your purposes, that is the tape that has the voices in the background screaming for help. have you had an opportunity to listen to that? >> yes. >> can you tell me the circumstances of the setting around the first time that you listened to it. >> the first time that i hea...

That to become evidence. and they are pushing to keep this animation out of the case. just yesterday, wolf, we heard from a long list of witnesses who really all seemed to be character witnesses, vouching for george zimmerman's voice on that 911 audio tape. and we saw the defense team put tracy martin on the stand, to explain what he told investigators, that that was not the voice of his son. listen. >> reporter: one after another after another, defense witnesses hammered home the same answer when asked who was screaming on this 911 call. >> do you think he's yelling "help"? >> yes. >> all rig...

Attorney mark o'mara wants to rest by wednesday or thursday, meanwhile, the major focus of the defense today was the 911 tape from the night of the shooting. close friends and former coworkers of zimmerman testimonied it was zimmerman's voice on that tape. watch. >> you know whose voice that is in the background screaming? >> yes, definitely. it's georgie. >> have you an opinion on whose voice that is? >> i thought it was george. >> why do you think that? >> just the tone, just the volume and the tone of what i was hearing, it was something that -- because i talked to him as much on the phone ...