Two U.S. states have legalized recreational marijuana, and more may follow; the Obama administration has conditionally accepted these experiments. Such actions are in obvious tension with three international treaties that together commit the United States to punish and even criminalize activity related to recreational marijuana. The administration asserts that its policy complies with the treaties because they leave room for flexibility and prosecutorial discretion.

The way the world looks at drug control is changing. There has been a growing awareness of the issue for the past decade, as well as increasing public outcry over what many see as a failure of the once popular "war on drugs." Nowhere is this battle more pronounced than in the so-called "marijuana wars," which are slowly growing into an old-fashioned standoff between the states and the federal government.