to be. >> cnn, denver. >> and this sunday is all about pot on cnn. at 9:00, weed 3 and at 10:00 the series high profits. and this weekend watch the global edition of "outfront" on cnn international. this weekend our exclusive reporting from south korea. thanks for watching. anderson starts now. good evening, thanks for joining us. we begin with breaking nuz. a huge gas line explosion with mult pell serious casualties. >> oh, my god. this is so freaking hot. oh my god. >> it happened in fresno california. you can see this was a damaging blast. so far 14 people have been hurt and three of them seriously. joining us by know is the fresno fire chief kerry doneas. i understand there were evacuations in the area of the explosion. do we know how this occurred? >> we have reports there was a -- a backhoe or a tractor of some type that was a around the

area of a 12 inch gas main that made contact with the main and created this large explosion. the problem was this gas main ran right underneath our train railway railway and adjacent to the freeways and so we have them blocked off until we can make an assessment. >> and in terms of the injured there were reports that 14 people were injured and one critically. do you have an update on that? >> that is still what we are aware of at this time. we had one of those three criticals and one of the criticals was med evaced to the burn unit regional medical center. >> how do you go about fighting a gas fire like this? >> well this is in an area that was pretty secluded fortunately it. was not surrounded by homes.

which was a blessing. we surrounded this with a very defensive attack a lot of grass, a grass fire occurred. not too many -- very small structured adjacent to it that were damaged but the significant damage is going to be obviously -- the victims and then the railway and possible freeway damage by this 12 inch gas main. >> and does -- when you are battling a blaze like this from a gas line i assume gas continues to come out of the line. so i mean does that present a particular difficulty? >> yeah. at this time the gas has dissipated somewhat. there is still gas flowing but not at the rate of speed that the main was caused such the explosion. that was a significant blast. so you do have some residual flame but right now we are surrounding until pacific gas and pow he can shut down the

flame which should be done in an hour to an hour and a half. >> thank you for taking to the time to talk to us. and the man who we want to talk to his voice out of breath on a mistake that left the suspect out of death. i shot him. i'm sorry. that was the tuls volunteer deputy and a big donor to the sheriff department. he mistook his gun for a taser. she's charged with manslaughter. he spoke this morning with matt lauer. >> take me back to the day this happened. >> i was parked down the street at the saintclair station where this took place. where the gun buy and the dope was purchased. he decided to bolt from the undercover's truck and run and he came to me. and two other cars that were in front. i was the last car, as i always

am. i've been involved in several hundred of these. i do clean-up when they are done. i take notes, i take photographs and that is my job. >> and when you got involved in in struggle mr. bates, did any of the other deputies or officers say help us taze him, use your taser? >> no. matt i yelled taser, taser, as required in training. the deputy below me ducked he pulled away from it so that i could -- now, i've never, you know -- first and foremost let me apologize to the family of eric harris. this is the second worst thing that has ever happened to me or first, after happened to me in my life. i rate this as number one on my list of things in my life that i regret. >> mr. bates would you stand up

for me for one second and show me where on your body in your uniform, you keep your taser and where you keep your weapon your revolver. can you stand up and show me? >> sure. you bet. my taser is right here in my front, tucked in a protective vest. my gun itself is on my said normally to the rear. >> and people are going to look at that, mr. bates and say how could you make this mistake? how could you think you were going for your taser on your chest, tucked into the vest and accidentally pull your weapon? >> well let me say this has happened a number of times around the country. i have read about it in the past. i thought to myself after reading several cases, i don't understand how this can happen. you must believe me. it can happen to anyone. >> you yelled taser, taser, you mentioned the other deputy ducked and cleared so you could use your taser and then you heard that gunshot.

what were you thinking when you heard the shot? >> oh, my god. what has happened. the laser light is the same on each weapon. i saw the light and i squeezed the trigger and then realized that i dropped the gun. this was not an intentional thing, i had no desire to ever take anyone's life. >> you can be heard on that tape saying i shot him, i'm sorry and there is a lot of emotion in your voice. what was the emotion? was it sorrow was it shock, was it fear for the repercussions of what you had just done? >> matt i never considered the repercussions of what i had just done. it was shock. i can tell you, it stayed with me for a number of days. i'm not at all sure it is not still with me today. lack of sleep, inability to concentrate, you know all of

those thing plus more. i still can't believe it happened. >> mr. bates, in the wake of this incident you have portrayed as a wealthy and generous supporter of the sheriff's department and a close friend of the sheriff who has been rewarded for your financial support with the opportunity -- and this is what is out there -- to play cop and carry a gun. is that a fair characterization? >> that is unbelievably unfair. i have donated equipment, as i saw fit, when the need -- happened to arise, to allow the task force and other areas of the sheriff's office to better do their jobs on the street of tulsa. >> you've been charged with second-degree manslaughter and face up to four years in prison. have you allowed yourself to think about that possibility? >> certainly.

how can i not? >> joining us now cnn legal analyst derek beganal ago os and currently professor of criminal justice of missouri in st. louis. and david, he said accidentally pulling his gun out instead of his taser could happen to anyone. do you buy that? because i think there are trained police officers around the country beg to differ. >> i don't know that it could happen to anyone i know it has happened ten times where officers have discharged their firearms when they thought they had a taser in their hand. it is rare but it has happened. and there was a gap, there was a bunch of these that happened in the first half of the decade of 2000 and then a gap until 2005 and then until 2013 and then 2014 and then this one.

>> mark you said bates should not have done this interview because the prosecution could use his words against him in court. do you hear anything potentially incriminating? >> the whole thing. he's admitted to the whole elements of the manslaughter. it is not intentionally. they charging him with manslaughter. he just gave the prosecution with every element number one. and number two, i don't want to diminish the fact that i'm sure he feels bad about it but there is going to be a prosecutor that will say, you feel bad about it? you start off as the second worse thing that has happened to you since you had cancer and then corrects himself and said the first and then he said this has stayed with me for a couple of days and still may be with me today. i guarantee you the family of the deceased will stay with them it is sticking with them a lot longer than that. so i don't think this did him any favors what soar. >> we're going to talk to the

brother of the man that was killed. and the tulsa world reported that the supervisors were ordered to falsify his records after the shooting but his attorneys vehemently denied that and if that is true how important is that for the sheriff's department? >> if that is true then this case goes from the one bad judgment of one individual in an isolated incident to some sort of epidemic or some sort of force-wide problem in the police department in law enforcement. and if that ends up being the case and records were falsified deliberately and because he couldn't otherwise pass the training then that will open up a pan dora's box of both civil and criminal potential liability for the police department especially if they were doing it to help out their buddy and even worse so if there is quid pro quo shown and by that i mean if for some reason down range it is shown that bates somehow gave

something to the police department so they would just jimmy up his records so he could keep going out there and doing things. if this is true and we don't know yet, but if it is it will turn this from an isolated incident into a massive problem. >> david, i want to play a bit of video from robert bates right before the shooting. now in this you see him running and you see the taser high up in the middle of his chest and not his gun but you say it was holstered on his right hip and pretty far away from each other to make a mistake like that. i don't understand if this happened a number of times before which you said are there not different pleaseures for taking the taser out out of the holster than taking a gun out of a holster. to take a police officers weapon from a holster, there is usually a special mechanism in that and you have to take it out in a particular way. is it the same mechanism for the

taser? >> it depends on the type of holster that the firearm is in. it depends on the type of holster this the taser is in. you are correct, there are many officers that carry holsters that do require a certain type of movement in order to get it out to try to defeat individuals trying to disarm an officer and it depends on the way the taser is in a holster and he said it was in a cross draw on his chest and it was three or perhaps four of the previous ones and also a cross draw configuration and when tasers first came into law enforcement, the modern tasers they would carry them in a drop holster on the thigh, the same thiep as the firearm. and wee moved away from that because we thought that putting it into a cross draw configuration would preclude that mistake but it continues to happen. and it is one of those things that human factors and researchers have looked at. i'm still scratching my head trying to understand how it

happened but we do know unless people are lying, these officers make this mistake and we have to figure out a way to prevent that to stop that. and one thing i want to talk about, way before this there are issues people need to look at in terms of how the entire operation happened and why in the world the suspect was able to escape the parking lot and start the foot pursuit in the first place. >> and david, what about the way the reserve officers are used? should he even have been on this even if he was several cars back? >> i do not know because i don't know his training. i have a friend out on the west coast who is a reserve police officer for a los angeles metropolitan suburb and he is 71 and i would ride with him in a heartbeat as would anyone that knows anything about law enforcement because he spent 30 years with the los angeles police department and worked for the s.w.a.t. and was a canine officer for years and someone

like that it is not a question because they were square add way. but the question is did this individual in oklahoma have the same type of training and experience i doubt it. and we need to good back into the training records to find out whether that particular individual was qualified. >> mike clinger, danny receive all os and make sure to set your dvr to watch 360. and coming up the brother of the suspect and how he came to mistake his revolver for the taser. and the friend who knee what terry mcnichols and mcveigh knew was about and he is a freeman today and the question is why isn't he behind bars.

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we're talking tonight about the killing in tulsa by eric bates. he spoke this morning to nbc's matt lauer. >> first and foremost let me apologize to the family of eric harris. that is the second worst thing that has ever happened to me. or first, that has ever happened to me in hi life. >> join us is eric harris's brother andre. i'm sorry you're with us under these circumstances. you heard mr. bates apologizing to your family saying it was the second worst thing to happen to him and then saying the first worst thing that has happened to him. do you accept his apology? >> well first i would like to thank you for covering this story and giving his brother his story and an opportunity to spread this case across the

nation and giving this case the attention it needs. >> and what about what mr. bates said at apology and what do you think? >> i would like to say that we accept mr. bates' apology. i've been forgiven of my sins of things in my past and absolutely i forgive mr. bates. however we still have to shine the line on the darkness. we still have to unveil this evil. mr. bates shouldn't have had to use a taser on my brother. mr. bates shouldn't have shot eric with a .357 magnum. mr. bates has a price to pay. >> when you say -- >> but i do forgive him. >> when you say that he shouldn't have used a taser on your brother, some people will say, look your brother had a long record was involved in attempting to sell a gun to nun undercover officer and then running from police and was

down on the ground. are you saying because he was down on the ground there was an officer on top of him, that he was already under control? >> yes, sir. there was numerous officers on top of him. as we can see in the video, one has him by the neck. one is pulling his arm out. and then mr. bates takes two steps and shoots my brothers with his .357. >> mr. bates has said it was accidental. his exact words was it was not intentional. do you believe that? >> i think the facts will come out to prove if it was accidental or not. one of my questions to mr. bates is: did he do his research on how many times the slip and capture happened before he shot my brother, or did he do his research after he shot my brother? >> you're asking that question essentially perhaps saying that

after shooting your brother, he or his attorney did research and came up with this reasoning of why this would happen as opposed to something that he actually knew as a potential problem? >> you know i once read in the book it said keep my commandments and you are my disciple. you know the treej and the treej will make you free. see, this is about truth. this is about unveiling the evil shining light on the darkness. see, we will get the truth out. and we'll know if mr. bates intended to do it or not. i'm saying in the video that we seen you can see mr. bates taser on his chest, it is bright yellow and if he had all of the training that he says he had, bring forth the information that everyone is asking for. and also after you bring forth that information, let the jury decide if he's innocent or guilty. but yes, i do forgive him.

>> do you have confidence in the justice system and confidence that a jury will decide? >> i have all of the confidence in the world. that my lord and savior jesus christ will make sure justice is served. >> andre -- >> eric's blood-eric's blood is crying from the streets wanting justice. and he is blood is crying for an officer or reserve deputy while laying on a ground for a man running 20 feet away and getting shot in the back. eric's blood is crying out for justice and will get the justice in jesus' name. >> thank you for being with us under these circumstances. thank you very much. and coming up, the jurors in the aaron hernandez case and what they think of the other evidence they did not get to see

and the evidence they learned from the judge once the verdict was read out in court. part two of the conversation with the jurors and we played part one last night. >> and why a group of doctors are fed up with dr. oz and want him drops from the medical school where he teaches when he is not on tv. ears buster's been busy. man: yeah, scott. i was just about to use the uh... scott: that's a bunch of ground-up paper, lad! scotts ez seed uses the finest seed, fertilizer, and natural mulch that holds water so you can grow grass anywhere! seed your lawn. seed it!

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aaron hernandez will have the rest of his life to think about the murder that a jury convicted him of this week. he's serving a life sentence without the possibility of parole in the killing of his one time friend odin lloyd and two other convictions on top of that. the jurors have been speaking out and talking to us about the legal basis for their decision. we spoke yesterday morning and here is more of that conversation. >> the joint venture theory is that it doesn't matter whether he was the one who pulled the trigger and was there and could have done something. how crucial was that in your decision-making? >> that was very crucial for me. >> whether he pulled the trigger or not didn't matter? >> right or not, it didn't matter he was there and he had seen how the situation arose and how it ended.

he was part of it. and i even for myself i sat there and said take him out of the equation. what would have happened? would we be sitting here today. >> and i saw you shake your head when you said take him out of the equation and would have happened and you shook your head no. >> he didn't know odin lloyd. why would those two people go there to pick him up to kill him when they didn't even know where he was. aaron was the only one who knew where he lived and drove the car, who drove home they got out of the car, we saw the video, like nothing happened. four of them were in the car, three of them came back to the house. it's horrible. >> and you actually had to read the verdict? [ laughter ] >> what was that like to stand in front of him and read the

verdict? >> it's incredibly overwhelming. incredibly emotional. >> guilty of murder in the first-degree. >> it was not one of us after we came out of there, there was not one of us including the men, who didn't have a tear in our eye who didn't cry. we hugged each other. the alternates came in and hugged us. it was very emotional. >> there was evidence that you didn't know about that you subsequently learned about, the text messages from odin lloyd and you heard that odin lloyd had sexted and she said who are you with and he texted nfl and he texted just so you know. >> well there must have been something he needed to tell his sister. why he would text her. did you see who i'm with? hello? because i saw it on tv last night. and it said envelope just so you know. why would you say that to your sister unless you knew something was going to happen.

>> so had those text messages been admissible which they weren't, had those been admissible that would have had a big impact on you? >> i know when i walked in there i made the right decision. >> it was more relief. there was more stuff, this is more information, it made me feel better but not more confident in my decision. >> when the judge also told you, after the verdict was already in after all was said and done that aaron hernandez is facing other murder charges, were you surprised? >> i was shocked. >> i was shocked. >> i was surprised. >> i understand and i appreciate that that information wasn't related to us during this trial, because you can run the risk of it corrupting your perception of aaron and that shouldn't have been done it wouldn't be a fair trial. >> it is interesting that the human side of this -- as much as you talk about facts, as much as

your there to examine evidence and kpleerly you -- clearly you bent over backwards to stick to the efts presented but you do register to the family dynamic and the family break-up and the humanness of it all. >> at the end of the day, a young man lost his life and there were countless people effected by that and you consider all of that. it is impossible not to think about that. >> and his family was affected every day? >> odin lloyds? >> yes. >> and you notice that? >> every day. >> yes. >> let's hope she has some peace. >> it is fascinating to discuss the details with that jury. more insight from jury consultant whose included o.j. simpson and heidi flies and others. and the jurors didn't know about the text messages and they didn't know about the

two other murder charges and they said that learning that made them relieved that they made the right decision and in the verdict and glad they didn't know about it during deliberations. what do you make of that? >> well it is pretty extraordinary. in a high profile trial like this the jurors didn't pay attention and didn't do their own independent research and they were diligent in really following everything. and here is a guy who played for the patriots their home team and sort of an icon and they knew they have his life in their hands. so it is a very difficult decision. so this after the fact information, you could see it causes great relief in them to see this reinforces their verdict and made it easier to swallow afterwards. >> and they made a point of telling me it is not that they doubted the verdict it was a reinforcement that they had made the right decision. and also really interesting to learn from the jurors that when

the defense did a 180 in their closing statement and admitted that aaron hernandez was at the scene of the killing, and previously hadn't said that and there was data admitted to show he in fact was, it confirmed evidence admitted by the prosecution, for some jurors that was incredibly significant and they had shocked them and also made them kind of doubt the credibility of the defense team which i found very interesting. >> right. and the defense is in a tough spot because they either have to choose one of two paths. one path is to just question and poke holes as much as they can in the prosecution case and say they haven't met their burden sand then they have to say this is what really happened. they have to say there is enough circumstantial evidence that puts him there and we have to provide some explanation. the problem is that all of a sudden that explanation was internally consistent with everything else including some

of that nonverbal behavior. if he was shocked that these two guys had killed his friend afterwards he's seen on tape laughing and joking and seeming cavalier about it and they use the the word indifference in tacking about his demeanor so the nonverbal behavior becomes almost as important as the actual evidence in the case. >> and i found that interesting because they made a big distinction between the nonverbal behavior in the tapes and the security camera as opposed to what they saw in court, which commentators were saying he has this swagger in court and he seems arrogant in court but the jury nearly all of them were saying we didn't pay any attention to him when he was in court. sometimes when we made eye contact it was awkward but that is all speculation. you can't judge somebody based on their body language but they did look at the security tapes and say, he's walking around the house with a gun and he seems

relaxed and his girlfriend is making smoothies the n. day and i found the distinction between that day and his behavior in court. richard, thank you. and 20 years after this plot is now a free man. his story next. y went right on living. but you see, with the help of her raymond james financial advisor, she had planned for every eventuality. ...which meant she continued to have the means to live on... ...even at the ripe old age of 187. life well planned. see what a raymond james advisor can do for you.

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this sunday marks 20 years since the oklahoma city bombing, 20 years since 168 lives met a violent end when a truck bomb exploded outside of theal friend murrah building and 20 years since patients were deprived of watching them growing up and the hundreds that were injured and the lives of those that were effected forever. the loss that day is described as senseless and the man who could have stopped it is today a freeman. gary tuck man reports. >> it is an amazing sight. a six-story building and one half of the building is sheer-- sheered away. >> mcveighs friend michael fortior talked to cnn from kingman, arizona. >> i do not believe that tim blew up any building in

oklahoma. there is nothing to look back and say i should have seen it. there was nothing like that. >> every one of the words a complete lie. michael mcguire would become his attorney. they met shortly after the cnn interview. >> i never forget what he said next. mr. mcguire, i know about the whole plan to blow up the building. >> timothy mcveigh, executed in 2001, and terry nichols in prison for life and michael fortior, neither of those things. in fact it is a secret where he is. how is that possible? that a man who admitted to not only knowing about the plan but admitted casing the morrow federal building with mcveigh and knew how the bomb was built and where the explosive material was purchased. how is it he is not now in prison? is it the least controversial and complicated. his lawyer executed these chorts in 1995 as fortior told him what

he knew. >> this is the diagram that tim drew out on a piece of paper what he called a shape charge. >> these are the barrels of explosives? >> this is how they would be set inside of the truck. >> we've seen a number of small children being carried, bleeding heavily from the face. >> the bombing is the deadliest home grown attack in history, and 119 children were killed. tonight the site of the building is a museum. >> fortior could have taken the information he knew from mcveigh and told authorities and stopped the bombing in its tracks and chose not to do so and 168 people were murdered. so what is he doing today? michael fortior is a freeman? >> he claimed he didn't think mcveigh would carry out the bombing plan. he agreed to a plea bargain, testifying against mcveigh and nick knolls and -- nichols and

was released a decade ago and now has a new identity and home town because is in the federal witness protection program. he still occasionally calls his lawyer. >> can you tell us where he is living and what his name is? >> no. >> but he's still married? >> yes. >> to the same woman? >> yes. >> and he has children. >> and how many children does he have? >> two. >> and does he live a normal live? >> no. he'll never be able to live a normal life. >> in the witness protection program you're given a new identity and his neighbors don't know anything about his background. that is the way it is supposed to work. >> i can't comment on that. >> and when you say he can't live a normal life. because of the traumas of the past or things in the present? >> the trauma of the past and the risk to him. >> his brothers were two of the children killed in the day care center. their grandmother is jany coverdale. >> it makes me hangry to know -- angry to know he's enjoying life

and all those people are dead and we are still suffering. >> i had broken ribs a punctured lung and i looked like i'd been beaten with a baseball bat. >> this woman was in the building trapped under the rubble for hours. she too has anger toward fortior. >> his life is going on but i feel like in the end he'll have to base judgment. that is my faith. >> he was dishonest and self-righteous when he talked to us. >> judge not, lest you be judged. >> he could have stopped it and yet he is living this semi normal life with his family and children. >> i think carrying guilt is under understatement. >> gary joins us now from oklahoma city. and so the lawyer said he feels guilt about his role but has he ever publicly apologized?

>> the answer is yes, anderson. during a sentencing hearing he cried and asked forgiving and some of the family members were satisfied by that but others thought it was a cynical attempt to influence the judge who hadn't yet sentenced him. and his wife was alleged to have laminated a fake driver's license and she testified against mcveigh and in exchange she did not serve one day in jail. >> interesting. gary. we appreciate it. and dr. oz under attack and this time members of congress calling him on the carpet and a group of fellow doctors calling him out for claims that he makes.

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tonight, something you couldn't hear often, a group of doctors calling for one of their own to be fired from an ivy league medical school. the doctor dr. oz from the columbia university medical school. he's been criticized over the products he's promoted on his show but this time members of his own profession are leading the charge. here is elizabeth cohen. >> there is nothing ambiguous in the letter 10 doctors wrote to the dean of the columbia university medical school. >> we are surprised and displayed that the college of physicians and surgeons would permit dr. oz to occupy a faculty point. he's shown dismay and lack of

integrity by promoting quack treatment for the interest of personal financial gain. >> he's touted miracle drugs for weight loss which causes people to spend huge amounts of money for treatments that have no benefit whatsoever. >> he said at most universities if someone did this -- >> that is grounds for dismissal. >> columbia university responded, telling cnn they won't stop faculty members from speaking their minds. in a statement today, oz said we provide multiple points of view including mine which is offered without conflict of interest and that still doesn't sit well with certain agendas that distort the facts. he rose to fame on oprah as his go-to doctor and spun off his own tv show. it wasn't long before his product promotion promoted

controversy. >> he was brought before a senate sub-committee and called to the carpet. >> why do you say this stuff because you know it is not true. so why, when you have this amazing megaphone, and this amazing ability to communicate, why would you cheapen your show by saying things like that? >> i actually do personally believe in the items that i talk about in the show. i passionately study them. i would give my audience the advice i give my family all of the time and i have given my family these products. >> this little bean has scientists saying they found a magic weight loss cure. >> the makers of one weight loss product was sued for false advertising and settled for $3.5 million. all fodder for the doctors asking columbia university to rethink oz's position. >> elizabeth cohen joins me now. have we reached out to doctor oz and have they made a statement. >> they made a statement and

then sent us an e-mail. it said that they list the names of five of the ten people who complained about dr. oz and then the e-mail -- the spokesperson for dr. oz questioned the integrity and the qualifications of the people pointing the finger at dr. oz. we just received this e-mail so we haven't had a chance to sharefy any -- to verify any of us. but what dr. oz's spokesperson is doing is saying is he is pointing the finger at these doctors and saying they have problems of their own. >> joining me a pediatrician from the professional ethics dr. moon. he say he is on the boundaries of ethics for a physician. how so? >> i think that dr. oz has played several different roles. on his television show he is part entertainer, part motivational speaker and in part someone who is wearing the uniform of a physician and

promoting himself as a highly trained physician, but what he does there is use information in a way that i think touches the boundaries of what it is to be a physician. when dr. oz presenting himself as dr. oz and not just mr. oz he uses information in a way that is not adherent to the knowledge, i think he does bump up against the edges of what is aepable behavior for a physician. >> do you think he crosses the line. he talks about revolutionary cures and miracle krurs one graphic behind him and they were talking about some miracle dietary supplement or dietary formula and the graphic behind them said no exercise no diet i mean does that cross the line to you? >> well i think that did cross the line because it turned out that was completely false and to his credit he took that down and

admitted that was a mistake. so science is full of mistakes and even sometimes i have to go back to my patients and say, yep, i was wrong about this one and we're going to take a different approach and i think it is fair to say that about half of what he says in terms of the advice he gives has some grounding in scientific evidence and another quarter has probably no grounding whatsoever and another quarter is neither here nor there. >> and is that good percentages? 50% grounded in scientific evidence and do you think the people that are watching -- he is a respected doctor or has been and is affiliated with a respected hospital is 50% good enough? >> no. not for somebody who is being a physician? but remember in that television show i think it is fair to say that he's not actually being a physician, he's being an entertainer and maybe being a motivational speaker. but the problem is he's advertising himself as a physician physician. so i think he should be more

clear about which hat he's wearing at a specific time in the show or stop calling himself a doctor when he is printing this information not grounded in evidence. >> dr. moon i appreciate you being on. thank you so much. >> appreciate it. just ahead, dr. sanjay gupta investigating the medical marijuana revolution we'll have a preview of weed 3. that is next.

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a new installment of the documentary "weed 3" is this weekend. and dr. sanjay gupta is looking is the benefits. here is the preview. >> can you push button number one for me. >> it is the most exciting time i can think of for marijuana research. this is high times in marijuana research. it really is. >> what i need you to do is identify the number that is different, okay. >> harvard university dr. stacy gruber has been researching marijuana since the early 1990. they call her the pot doc. we met her two years ago when she was researching the possible

damage of recreational marijuana to the brain. now she's also set her sites on the possible benefits of medical marijuana. massachusetts, as it turns out, is the perfect place for the study. because they just legalized medical marijuana. gruber's goal is to study new patients who have never used cannabis. >> our goal was to use at the folks before they started using medical marijuana and then three months in, six months in and a year. primarily to look at frontal executive functions because that is the big question. >> that question how does medical marijuana impact brain function longer term? >> and all we want you to do is name the blocks of color. >> before and after they start medicating patients will take cognitive tests. and here is what is revolutionary. they are going to have their brains scanned to chart the change. for the first time we'll see

what your brain looks like on weed. >> fascinating. the documentary "weed 3," sunday 9:00 p.m. pacific and followed by 10:00 of high profits and find the opt ed describing the marijuana revolution that he sees everywhere. it is a great read at cnn.com. that does it for us. have a great weekend. thank you for watching. anthony bourdain parts unknown, starts right now. pity the salary man.' tokyo's willing cog in an enormous machine requiring long hours, low pay, total dedication. and sometimes, what's called karoshi, death by overwork. here in a society of tight spaces and many