Mexico changed its constitution on Monday to allow state and local police to pursue drug traffickers, removing a major stumbling block in anti-drug efforts that had long been the exclusive realm of federal officers. The measure is part of a package of bills that includes the possibility of using millions of dollars in seized drug money to fund rewards for the capture of traffickers; the blocking of cell phone calls from inside prisons and the registration of bulletproof cars frequently used by drug traffickers. Full Story