Chris Hondros/Getty Images
A portion of marijuana is seen under a magnifying glass at "Abundant Healing" store April 19, 2010 in Fort Collins, Colorado.
Twenty states have legalized medical marijuana, including California.
There's a lot of anecdotal evidence that pot can help combat depression and ease anxiety, and yet there isn't a whole lot of scientific research to back those claims. But that could soon change.
Sue Sisley, MD, joins the show to talk about the hurdles she faces in doing a clinical study with marijuana.