In one of the few scientific developments likely to interest both the Governor of North Dakota and Method Man...
http://www.popsci.com/scitech/article/2009-09/scientists-find-thc-gene-hemp
Will be interesting to see where this goes. One of the strongest arguments I've heard against medicinal use of pot is lack of control of the quantity of psychoactive ingredients. If they refine this to a controllable process, that point essentially becomes moot (THC isn't the only psychoactive compound in pot, but is one of the most prevalent, and is generally attributed to the plants medicinal properties).