Following the Sept. 11, 2001 attacks, the Bush administration initiated new human intelligence collection programs. To that end, it detained and questioned an unknown number of people suspected of having links to terrorist organizations. As part of these programs, the Bush administration redefined acts — such as waterboarding, forced nudity, sleep deprivation, temperature extremes, stress positions, and prolonged isolation — that had previously been recognized as illegal, as “safe, legal, and effective” “enhanced” interrogation techniques.