The head of the U.N. drug watchdog agency is urging U.S. federal officials to challenge ballot measures in Colorado and Washington that decriminalized possession of small amounts of marijuana for adults 21 and over.
With recent passage of measures in Washington and Colorado legalizing marijuana for recreational use, now the question arises, how much is too much to drive?
Mexican President Felipe Calderon says the legalization marijuana for recreational use in two U.S. states limits that country's "moral authority" to ask other nations to combat or restrict illegal drug trafficking.