Marijuana Dominates Nation's Arrests - SF Weekly (blog)

There were 1.26 million arrests for theft, and 1.21 million people were busted for DUI. That means that drug violations are the most common crime in America, with 1,531,251 arrests, the FBI reported. And of these, marijuana crimes made up nearly half, with the vast majority -- 81.8 percent -- of busts for simple possession.

All told, there were nearly 4,000 arrests per 100,000 people in 2011.