CNN Weed 2 Cannabis Madness Dr. Sanjay Gupta December 1, 2014 03:38:00
More than 50% did get relief and continued on the drug. all of that makes it a potentially powerful medicine for the 2.3 million ms sufferers worldwide. it's now available in 25 countries, but not the united states, where it's still under investigation. why so much more stringent in the united states? >> i think there is a greater level of rigor at all levels of regulatory inquiry in the u.s. >> like any drug in the united states, cannabis would have to go through rigorous testing, research and approval by the fda. but after that, things start to get tricky. marijuana also needs the approval o...