Former undercover DEA agent, Celerino Castillo III, tells us about training death squads, blowing up cocaine labs, and how the cartels are controlling both sides of the border. Watch more VICE documentaries here: http://bit.ly/VICE-Documentaries Check out our full video catalog: http://www.youtube.com/user/vice/videos Videos, daily editorial and more: http://vice.com Like VICE on Facebook: http://fb.com/vice Follow VICE on Twitter: http://twitter.com/vice Read our tumblr: http://vicemag.tumblr.com