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>> fda deputy director douglas throckmorton. >> for marijuana, three agencies are involved in making sure they're available to get the marijuana and able to conduct the trial. >> he's talking about the food and drug administration, the drug enforcement administration, the national institute on drug abuse. and if you're a privately funded cannabis study like sisley and doblin's, you have to get the approval of the united states public health service. it is a lot of government red tape, and it is an issue we reported on in our earlier documentary, "weed." >> it was a schedule 1 controlled substa...

That works. a veteran and a stay-at-home mom suffering from ptsd. a truck driver with alzheimer's. we're in the midst of a marijuana revolution. scientists are poised to prove marijuana can change lives. >> this is high times in marijuana research. it really is. >> and for elected leaders as well. >> this bill that we're introducing -- >> the tide may be finally turning. >> our drug laws in this country as a whole need a revolution of common sense and compassion. >> i'm dr. sanjay gupta. this is "weed 3: the marijuana revolution." >> i just went every day and sat by his bedside, and they told ...

A veteran and a stay-at-home mom suffering from ptsd. a painter with chronic pain. a truck driver with alzheimer's. we're in the midst of a marijuana revolution. scientists are poised to prove marijuana can change lives. >> this is high times in marijuana research. it really is. >> and for elected leaders as well. >> this bill that we're introducing -- >> the tide may be finally turning. >> our drug laws in this country as a whole need a revolution of common sense and compassion. >> i'm dr. sanjay gupta. this is "weed 3: the marijuana revolution." >> i just went every day and sat by his bedsid...

In "weed 3." the ridiculist is next. i care deeply about the gulf. i grew up in louisiana. i went to school here. i've been with bp ever since. today, i lead a team that sets our global safety standards. after the spill we made two commitments. to help the gulf recover and become a safer company. we've worked hard to honor both. bp has spent nearly 28 billion dollars so far to help the gulf economy and environment. and five years of research shows

Watch "weed 3" the revolution tonight at 9:00 p.m. here on cnn. a unique look inside two colorado dispensaries fighting to stay open.