 The International Narcotics Control Board (INCB) reports that although the central government of Mexico has made concerted efforts to reduce corruption in recent years, it remains a serious problem.Some agents of the Federal Investigations Agency (AFI) are believed to work as enforcers for various cartels, and the Attorney General (PGR) reported in December 2005 that nearly 1,500 of AFI's 7,000 agents were under investigation for suspected criminal activity and 457 were facing charges.In recent years, the federal government conducted purges and prosecution of police forces in Nuevo Laredo, Michoacán, Baja California and Mexico City.