The United States-Mexico border zone is one of the busiest and most dangerous in the world. NAFTA and rapid industrialization on the Mexican side have brought trade, travel, migration, and consequently, organized crime and corruption to the region on an unprecedented scale. Until recently, crime at the border was viewed as a local law enforcement problem with drug trafficking--a matter of \u201cbeefing\u201d up police and \u201chardening\u201d the...