The CIA began using so-called enhanced interrogation techniques on terror suspects at black sites around the world in 2002.These included use of waterboarding to simulate drowning, stress positions, and sleep deprivation.
Following a series of news reports detailing this activity, the Senate Intelligence Committee in 2009 authorized a comprehensive review of the program. While panel lawmakers had been informed of the program by agency briefers, a preliminary staff inquiry showed that the interrogations were harsher than they had been described, according to Senator Feinstein, the committee chairman. The panel was also concerned about the CIA’s destruction of some videotapes of interrogations, seeing it as possible destruction of evidence.