>> absolutely, at every level. >> but u.s. and mexican agents never gave up on capturing el chapo. a 30-year veteran of the d.e.a., derek maltz, ran the special operations division and oversaw his agents' efforts to bring the drug lord to justice. >> even though they were unsuccessful, in the sense, of capturing chapo guzman, they were very successful in the developing intelligence, the knowledge of how these cartels were operating. >> drew hogan and diego first joined the hunt with a daring move by infiltrating el chapo's sinaloa cartel. when did he get on your radar in a way that i think i might be able to get him, or i want to hunt him? >> that would have been 2010 into 2011, where diego and i started moving sinaloa cartel money. >> he and diego worked as part of a task force. diego was a local detective not a federal agent like drew. these are photos taken during their operations. diego passed himself off as a big-time operator as drew coordinated behind the scenes.