When can we get Human Studies?

WebMD has released an article about the effects Marijuana has on Cancer. Once thought that the Cannabinoids were only good for the nausea and pain caused by cancer treatment it is now suggesting that it can slow the spread of cancer. This research was completed on animals and in test tubes and these tests have shown the anicancer effects of Medical Marijuana. Recently the increase in findings of medical cases for marijuana use has proven that the illicit drug is a great medicine. My only question now is when will the US allow research on this plant and start treating it as a medicine and not the root of all evil. WebMD is a great resource that many doctors are using and have for a long time. How can a doctor read findings like this and not worry about if they are giving the proper care to their patients?