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CONFIRMED: The DEA Struck A Deal With Mexico's Most Notorious Drug Cartel
An investigation by El Universal found that between the years 2000 and 2012, the U.S. government had an arrangement with Mexico's Sinaloa drug cartel that allowed the organization to smuggle billions of dollars of drugs while Sinaloa provided information on rival cartels.
Sinaloa, led by Joaquin "El Chapo" Guzman, supplies 80% of the drugs entering the Chicago area and has a presence in cities across the U.S.
There have long been allegations that Guzman, considered to be "the world’s most powerful drug trafficker," coordinates with American authorities.
"On March 17, 2009, I met for approximately 30 minutes in a hotel room in Mexico City with Vincente Zambada-Niebla and two other individuals — DEA agent David Herrod and a cooperating source [Sinaloa lawyer Loya Castro] with whom I had worked since 2005. … I did all of the talking on behalf of [the] DEA."
A few hours later, Mexican Marines arrested Zambada-Niebla (a.k.a. "El Vicentillo") on charges of trafficking more than a billion dollars in cocaine and heroin. Castanon and three other agents then visited Zambada-Niebla in prison, where the Sinaloa officer "reiterated his desire to cooperate," according to Castanon.
https://www.businessinsider.com/the-us-government-and-the-sinaloa-cartel-2014-1