The secret settlement in the suit, brought on behalf of two living ex-detainees and one who died of hypothermia after brutal questioning in US custody, avoided what would have been the first public trial of the Central Intelligence Agency's use of torture on suspected Al-Qaeda members.

But it also allowed the two psychologists who supplied the CIA with "coercive" interrogation techniques, James Mitchell and Bruce Jessen, to maintain that they personally had nothing to do with the use of waterboarding, extreme stress positions and beatings on detainees.

"Neither Dr. Mitchell nor I knew about, condoned, participated in, or sanctioned the unauthorized actions that formed the basis for this lawsuit," Jessen said in a mutually agreed statement attached to the settlement.