I‘m confused. When I walk around busy midtown Manhattan, I often smell marijuana. Despite the crowds, some people smoke weed in public. Usually the police leave them alone, and yet other times they act like a military force engaged in urban combat. This February, cops stormed a Columbia, Mo., home, killed the family dog and terrorized a 7-year-old boy — for what? A tiny quantity of marijuana.

Two years ago, in Prince George’s County, Md., cops raided Cheye Calvo’s home — all because a box of marijuana was randomly shipped to his wife as part of a smuggling operation. Only later did the police learn that Calvo was innocent — and the mayor of that town.