Mexico’s president said Wednesday his government will consider a plea by imprisoned drug lord Joaquín “El Chapo” Guzmán to be returned to Mexico, presumably to serve out his sentence.

For decades, the DEA has supported special units abroad, whose agents are local police officers vetted and trained by the U.S. Now, former agents and members of those units —some of them currently facing criminal accusations— reveal that the drug cartels bribed them while they had access to sensitive information from the U.S. government.