Late last month, a Northwestern University law professor published an article calling into question the veracity of a widely lauded book by Alice Goffman, one of sociology’s brightest young stars. The book, On the Run: Fugitive Life in an American City, is an ethnographic study of a black neighborhood in Philadelphia where, according to Goffman’s research, residents live in a mini–police state, constantly in fear of being arrested and sent to jail or prison, often for minor offenses.