Waterboarding

"The Interrogator: An Education" by Glenn L. Carle. Reviewed in the Wall St Journal by Ali Soufan. The author retired from CIA, the reviewer retired from the FBI, and both of them did some of the interrogation of 9/11 detainees. They both conclude that "enhanced interrogation techniques" (aka waterboarding) did no good. Under duress, all but the dumbest detainee would tell the interrogator anything he wanted to hear, just to make it stop hurting.