Rule of law seems to have completely broken down in the southern Mexican state of Guerrero, with the back-country really run by competing murderous narco-gangs. On Nov. 25, a Mixed Operations force of army and state police troops discovered over 30 bodies buried in mass graves in the municipality of Zitlala, in the rugged highlands where hidden canyons produce copious crops of opium and cannabis. The remains—including 32 corpses and nine severed heads—were found in a series of 20 hidden graves. Several men were detained, and cars and weapons seized. Such finds have become alarmingly common in Mexico in recent years, and are dubbed "narco-fosas" (narco-graves).