BiPolar is chronic depression. CBD's more or less work on your body. THC works to increase serotonin, but not on a level like meth or cocaine. CBD's would be like treating bi polar with tylenol - It may take away some of the body aches, but its not going to do a damn thing for treatment of depression.

As I said before, the danger isn't using it for treatment - The danger is discontinuing use.

Here are some worldwide studies, please pay close attention to 2007 in montreal:

Marijuana for depression & bipolar disorder | Patients for Medical Cannabis