CNN's award-winning chief medical correspondent Dr. Sanjay Gupta, a chief neurosurgeon, puts medical marijuana under the microscope. All three of CNN's current "Weed" documentaries compiled into one video.

The three parts are:

WEED: A CNN Special Report by Dr. Sanjay Gupta (2013)

WEED 2: Cannabis Madness – A CNN Special Report by Dr. Sanjay Gupta (2014)

WEED 3: The Marijuana Revolution – CNN Special Report by Dr. Sanjay Gupta (2015)