Criminology and Psychology

Vicente Zambada's lawyers claim he and other cartel leaders were granted immunity by U.S. agents — and carte blanche to smuggle cocaine over the border — in exchange for intelligence about rival cartels engaged in bloody turf wars in Mexico. Controversial defence: Vicente Zambada's claim could throw new light on how U.S. authorities deal with Mexican drug cartels Experts scoff at the claim, which U.S. prosecutors are expected to answer in a filing Friday in federal court. But records filed in support of his proposed defence have offered a peek at the sordid world of Mexico's largest drug syndicate, the Sinaloa cartel, which is run by his father, Ismael Zambada, and Mexico's most wanted man, Joaquin 'El Chapo' Guzman. It's a world of brutality, greed and snitching, and federal agents would love to have the younger Zambada pass along more intelligence, especially if it could help bring down his family's operation or lead to the capture of Guzman, a billion...