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>> and that something i witnessed firsthand driving around with 19-year-old chaz moore. the day i spent with him, he had been smoking all day long. >> do you feel impaired at all? >> no, i don't. i feel normal. >> turns out, when you test people who have a lot of experience with cannabis, you don't see many disruptions. but if you test people who have sort of a limited history with cannabis, you can see some clear pronounced disruptions. >> of course, no one thinks that driving when using marijuana is a good idea. but what scientists can't answer is if there is a safe legal limit. and if peopl...

Eighth grader has any brain activity, proof to the hospital that doctors should not remove the ventilator. as they wait, the family has also presented the hospital with a court order to stop doctors from removing jahi's life support. >> regardless of the results now, with this in place, they still can't move. this letter is going to buy us time. that's all we've been asking for is time. this letter is going to buy us time. >> an official told cnn the hospital decides if jahi should stay on life support because she technically died on thursday. you see, jahi underwent thursday back on december ...

Tape, seemingly fast asleep. many victims of something called micro-sleep. episodes of sleep as brief as a few seconds. your eyes could be open but your brain is asleep. >> micro-sleep is a brief transition from wakefulness to sleep. it can last up to maybe 20 to 30 seconds. >> reporter: tuesday night i found out firsthand when investigating the effect of sleep deprivation on driving. staying awake 30 hours and wired up behind the wheel on a test track. i thought i had done okay but my brain scan i had dozed off 22 times without realizing it. those jagged lines signaling sleep. >> you had doze...

Will bind to these abnormal proteins that we see in cte. so if you have them in your brain, it can diagnose this in a living person. >> reporter: nurn julian bails, former physician for pittsburgh steelers is part of the team that devised this brain scan. he acknowledges it is too early to tell if the test is reliable, sample size is too small and results need to be peer reviewed. it is believed cte played a role in the death of former players dave duerson, junior sao and others. allen schwartz that covered those for "the new york times" says the nfl brushed aside key early research. >> each o...

Against the philadelphia eagles was the worst one tony dorset ever took. he says hits like that left him with menacing symptoms, depression, outbursts of temper. >> not remembering. i been taking my daughters to practice for years and all of a sudden i forget how to get there, have to ask my wife how do you get there. >> reporter: dorsett doesn't know how many concussions he got in his hall of fame career or during four seasons in college, but he is one of nine former nfl players that had a new brain scan that may help identify chronic encephalopathy, a brain disease caused by head trauma link...