James Mitchell - Interrogator for the CIA, 2002-2009

Zeinab Badawi speaks to James Mitchell, an American psychologist who helped draw up and carry out the CIA's enhanced interrogation programme after the September 11 attacks.

Mitchell personally interrogated some of the top terrorist suspects using the programme's techniques, including waterboarding. His critics label him a torturer, though he says he has nothing to apologise for and that what he did was harsh, though legal and necessary.