Investigating the Mexican Drug Cartels

For more than a decade, Ioan Grillo has covered the surreal and ultra-violent world of Mexican cartels, putting together the skills required to get close to the gangsters.

He discusses how he tried - and often failed - with many techniques and how he eventually found a way to get close to, and interview serial assassins and traffickers. Grillo talks about reporting on the cartel death squads and the personal risk involved.