Mexico has pretty much always been a rough-and-tumble place. In recent years, however, the security environment has deteriorated rapidly, and parts of the country have become incredibly violent. It is now common to see military weaponry such as fragmentation grenades and assault rifles used almost daily in attacks. In fact, just last week we noted two separate strings of grenade attacks directed against police in Durango and Michoacan states. In the Michoacan incident, police in Uruapan and Lazaro Cardenas were targeted by three grenade attacks during a 12-hour period. Then on Feb. 17, a major firefight occurred just across the...