Harvard scientists just recently discovered this.
http://www.sciencedaily.com/releases/2007/04/070417193338.htm
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So, it seems pretty reasonable to surmise that people with THC in their system are far less likely to drive drunk, which is undeniably a far more serious problem than weed. Plus, driving while overly tired has been proven to be equally as bad as driving drunk, and is now illegal in some states. While I definitely don't advocate driving high, it's ludicrous to make such a fuss over it when there are so many much more serious forms of impairment.