Federal law says marijuana's more dangerous than cocaine — as bad as heroin. Yet a lot has changed since the Federal Controlled Substances Act became law in 1970, and 52 percent of Americans want it legalized for recreational use. Colorado and Washington are the first states to go that far, but medical marijuana has been approved by voters in 18 states and the District of Columbia. What's the Obama Administration to do? A crackdown might lead to a backlash. But can it enforce the law differently in different parts of the country? Statements by the Drug Czar, the Attorney General and even the President are hard to reconcile. We look at the available options.