In the Washington Post, an extensive report by Dana Priest on the changing role of the U.S. in Mexico's intelligence war on drug cartels. The article includes extensive details on how closely intertwined the CIA and other US agencies have become with Mexican law enforcement entities:
The administration of former president Felipe Calderon had granted high-flying U.S. spy planes access to Mexican airspace for the purpose of gathering intelligence. Unarmed Customs and Border Protection drones had flown from bases in the United States in support of Mexican military and federal police raids against drug targets and to track movements that would establish suspects' "patterns of life." The United States had also provided electronic signals technology, ground sensors, voice-recognition gear, cellphone-tracking devices, data analysis tools, computer hacking kits and airborne cameras that could read license plates from three miles away.
(HT: Shannon Young)