The Am Law Daily was fascinated by the conclusion in "Freakonomics" that the huge drop in crime in the 1990s could be attributed to the legalization of abortion in Roe v. Wade. But there's a single paragraph in that discussion in which the book's co-author, Steven Levitt, an economist at the University of Chicago, discusses the possibility that laws allowing people to carry concealed weapons might be responsible, in part, for a drop in violent crime. The best-known proponent of that argument is a conservative scholar named John R. Lott, now at the University of Maryland, who wrote the book...