Race, Lead, and Juvenile Crime

I know, I know: I'm a broken record on the subject of lead exposure in kids and crime rates 20 years later. But there's lately been a renewed focus on black crime and black incarceration rates, as well as the racial profiling of blacks and Hispanics in New York City's stop-and-frisk program. Guess what? The lead theory has something to say about that. For starters, did you know that arrest rates for violent crime have fallen much faster among black juveniles than among white juveniles? They have...