The Interrogator is the story of a former FBI Agent who has decided to blow the whistle on “the war on terror.” Ali Soufan interrogated some of the most high-ranking Al Qaeda operatives around the world. He gives FRONTLINE an insider’s view of why the attacks on the World Trade Center could have been prevented and how the use of coercive interrogations failed to produce actionable intelligence. Also in this hour: Pulitzer Prize-winning Washington Post reporter Dana Priest investigates the terrorism-industrial complex that grew up in the wake of 9/11. Against a backdrop of recent mail bomb threats from Al Qaeda in Yemen and growing concerns about homegrown terrorists, Priest explores the growing reach of homeland security, fusion centers, battlefield technologies, and data-collecting into the lives of ordinary Americans.