sarah dallof is outside the courthouse in sanford, florida, with the latest for us. >> reporter: good morning, richard. just before the end of court yesterday, the judge ruled to allow trayvon martin's toxicology report that shows thc, the main ingredient in marijua marijuana. monday afternoon, defense called tracy martin, trayvon martin's father, to the stand to testify. he denied telling investigators that the voice on the 911 tape screaming for help was not his son. >> i kind of pushed away from the -- away from the table and just kind of shook my head and said i can't tell. >> reporter: he told prosecutors he listened to the tape multiple times at the mayor's office weeks later. >> basically what i was listening to, i was listening to my son's last cry for help. >> reporter: earlier in the day, the defense brought back those two investigators to talk about martin's initial response to the 911 tape. >> there's no doubt he was telling us that that didn't sound like his son to him. >> those cries were front and center for a large portion of monday's testimony. the defense called mult

nbc's sarah dallof joins us from sanford, florida, with all the latest. rah, good morning. >> reporter: well, good morning, veronica. before the defense takes the reins, it's expected the court will hear from trayvon martin's mother in what should be some of the most emotional testimony of this trial. after a brief break for the july 4th holiday, the jury returns this morning. the judge had indicated the prosecution planned to end its case by wednesday, but the testimony of key technical witnesses filled the day. a gun and trayvon martin's sweatshirt brought before the jury to help a state ballistics expert demonstrate the contact shot that killed the 17-year-old. >> meaning the muzzle or the end of the barrel of the gun was up against the sweatshirt when it was fired. >> correct. >> and nothing but the truth so help you god. >> yes. >> reporter: and testimony from a police crime lab analyst who stated he found neither zimmerman's dna under martin's fingernails nor martin's dna on the pistol grip of zimmerman's gun. >> and you were able to exclude trayvon

. >> sarah dallof live for us in sanford, thank you. >>> in the wake of george zimmerman's acquittal, protests are popping up nationwide and they grew in size and intensity sunday night. from new york, to washington to chicago to l.a., where protesters marched on interstate 10 shutting down the freeway for nearly an hour. at least one person was arrested. demonstrates marched and carrying signs calling the verdict an injustices to trayvon martin the most vocal showing since the verdict of the 17-year-old, others have shown support for the acquittal, namely on social media. facebook pages his support has thousands of likes. >>> a new report out this morning says edward snowden has highly sensitive documents on now the national security agency could would work. telling that the documents are basically an instruction manual for how the nsa is built. >> in order to take documents that proved that say it was true, he had to take onces that included very sensitive blueprints of how the nsa does what they do and so he's in possession of literally thousands of documents that contain very spec

nbc's sarah dallof is live for us outside the courthouse in sanford, florida. sarah, good morning. >> reporter: good morning, paige. a lot of big developments yesterday, but the main headline, george zimmerman will not testify. >> the defense would call robert zimmerman sr., your honor. >> after four days of testimony, attorneys for george zimmerman who pleaded not guilty to second-degree murder wrapped up their case with zimmerman's father. one last witness testifying the screams on the 911 call. >> i told them absolutely it's my son, george. >> i am asking your client questions. please, mr. west. >> reporter: it was a day sprinkled with heated exchanges between the defense and judge deborah nelson, specifically when the judge asked zimmerman if he would be taking the stand. >> i object to the court inquiring to mr. zimmerman about his decision whether to testify -- >> your objection is overruled. >> zimmerman told the judge he had not yet decided, but would do so by the end of the day. >> and what is your decision, sir? >> after consulting with counsel, not to

now to sarah dallof in sanford, florida. what are the latest developments less than 48 hours after this verdict? >> reporter: well, good morning, betty. a lot of protests from coast to coast. and overwhelmingly, they have been peaceful. but that does not mean that emotions are not running high. >> we the jury find george zimmerman not guilty. >> reporter: seconds after the verdict was read in the courtroom, reaction to george zimmerman's acquittal spilled into the streets. >> how you can murder an innocent child and sleep at night? >> the system has failed us because if shows this is a continuation of racial oppression. >> reporter: news of demonstrations spread across social media. thousands marched in tallahassee, chicago, new york and other cities. firing up debate about gun control, race and self-defense laws in the nation. >> this has definitely been a tragedy, but coming from the tragedy has been a movement which we are and we love it to be more awareness. not just a few people in sanford know about it but it's everyon

. >> sarah dallof, thanks to you. >>> new developments in a cold case across the pond.ice in the uk say they have identified 38, quote, people of interest in connection with the disappearance of madeleine mccann. the 3-year-old disappeared while on vacation off portugal with her family in 2007. >>> more violence in chicago. police say 19 people have been shot there just since wednesday including four deaths. those numbers include a 7-year-old boy who was shot while picnicking with his family. >>> well, a little dog went on a wild ride when he got trapped under the hood of his owner's car. no word on how he got there but a fire team planked to rescue the pup and he is doing a-okay. he's just a little thirsty. >>> mexican volcano was the cause of major flight delays. it prompted u.s. airlines to postpone or cancel flights out of mexico city's international airport. >>> if you feel like ads and commercials are everywhere, think again. skygo, a mobile streaming service is putting talking ads on trains that are activated when a commuter rests their head against the train win

nbc's sarah dallof is outside the courthouse in sanford, florida, for us. good morning to you. >> reporter: good morning, richard. a new week and a new chapter in the trial of george zimmerman. as the defense prepares for its first full day at the helm. through nine days of testimony and 38 witnesses, the prosecution laid out their attempt to show george zimmerman as an overzealous neighborhood watch volunteer who set into motion a deadly chain of events. now it's the defense's turn. so far, they've been able to outside prosecution's own witnesses to build a case of a man protecting his own life when he pulled the trigger. they could wrap up by wednesday or thursday. >> i think everybody else on the outside was sort of, wow, look what's happening with the state witnesses. but i new they were not state witnesses or defense witnesses. they're people who saw what they saw and are going to report about it. >> my youngest son is trayvon benjamin martin. he's in heaven. >> reporter: before resting friday, prosecutors called trayvon martin's mother to the stand to

. >> sarah dallof, thanks so much. >>> joining me now, criminal defense attorney and arise news legal contributor, seema iyer and kendall coffey. we have a rest until jurors get back into the courtroom tomorrow but jurors got to see the interview george zimmerman did with fox news in which he says he knew nothing about florida's stand your ground law. but yesterday we heard testimony that conflicts that. take a look. >> what can you tell us about how long you spent as part of that course covering ideas like self-defense and stand your ground. >> right. self-defense is an affirmative defense. it is a big self-defense. it is not one of those things are you going to just whisk through in a day or after you teach it you're going to neglect from bringing it back into the classroom. so it was something that i constantly iterated. >> so carter claims zimmerman got an "a" in the class, he was a good student. how much do you think that that helps the case for the prosecution? again, when we talk about college, we're going back decades. this was 2010 for zimmerman's college. this was not that l