ACAPULCO- The decapitated heads of two police officials were found early Thursday dumped in front of a government building in this Pacific coast resort... The heads of police commander Mario Nunez Magana and officer Jesus Alberto Ibarra were found at the same site where four drug traffickers died during a shootout with law enforcement. The heads of the two -- who were involved in the Jan. 27 shootout -- were accompanied by sign that warned, "So that you learn to respect." They were discovered about 3 a.m. in front of the city's Finance Department -- just over a mile from...