At the Summit of the Americas, Prime Minister Stephen Harper expressed doubt about the war on drugs. “I think what everybody believes and agrees with, and to be frank myself, is that the current approach is not working, but it is not clear what we should do.” It’s admirable for a politician to admit uncertainty. And rare. Especially for a politician who has never expressed anything less than unshakable conviction in the Reaganite nostrums of drug prohibition. But Harper had good reason to be a little shaken.