The governments of Mexico and other countries have been doing drug dealing with the U.S. government for decades. Look up Albert Sicila Falcon and Pablo Escobar for starters. I also interviewed a former CIA (case officer) agent years ago who swore that he saw drugs in a hangar that were being transported by his employer. He would not talk about it over the phone. I had to drive to meet him and he traveled from another state. I believed what he had to say. This was not a one time thing either.
Word.
https://wikileaks.org/plusd/cables/1975MEXICO06495_b.html