The pretrial proceedings of Mexican drug kingpin Jesus Vicente Zambada-Niebla [provide] a glimpse into the transnational business of the Mexican drug cartels, which serve a growing demand for illegal drugs in the U.S. A member of the Sinaloa Cartel, Zambada-Niebla faces federal charges of trafficking tons of narcotics to Chicago and other cities using trains, ships, jets and even submarines between 2005 and 2008. Zambada-Niebla, 35, is considered a narco junior, as the sons of drug kingpins are known in Mexico. They have taken over the control of the cartels started by their fathers. The narco juniors are known for having attended private schools, being well-polished and having an appetite for luxury cars, designer clothing and beauty queens. Since Zambada-Niebla was extraded to Chicago in early 2010, his pretrial proceedings have sparked controversy on both sides of the border. He first complained about jail conditions. Then he dropped a diplomatic bomb, contending that he and another member of the Sinaloa cartel were informants for the Drug Enforcement Administration and had been promised immunity from prosecution. The federal authorities refuted the claim, but acknowledged that fugitive Sinaloa Cartel member and lawyer Humberto Loya Castro was indeed a DEA informant. In Mexico, the drug cartel wars have claimed more than 40,000 lives. The U.S. Justice Department thinks the Mexican cartels operate in more than 1,000 American cities.