Matthew Heineman, the BAFTA- and Oscar- nominated director, is one of the most exciting documentary filmmakers working today. His films City of Ghosts and Cartel Land offered searing comment on the fight against ISIS and the war on drugs. In conversation with Mariayah Kaderbhai (BAFTA) Matthew discusses these films and his latest documentary series The Trade depicting the US heroin epidemic. Supported by BAFTA.