Story highlights The ACLU filed a lawsuit for the records

Methods include mock burials and forcing detainees to wear diapers

(CNN) The Central Intelligence Agency has released 50 declassified documents detailing its use of brutal interrogation techniques on terrorist suspects in the aftermath of the 9/11 attacks.

The disclosure was in response to a Freedom of Information Act lawsuit filed by the American Civil Liberties Union (ACLU).

The documents made public a series of memos detailing interrogation methods that President Barack Obama has labeled "torture" but the CIA refers to as "expanded interrogation" and has also been called "enhanced interrogation techniques." The documents also contain internal discussions of the legality of these methods.

In a document titled "Description of Physical Pressures," potential physical and psychological pressures are discussed to include a facial slap, use of diapers, "insects," and "mock burial."

"One possibility is to threaten to place stinging insects into the cramped confinement box with" the detainee "but instead place harmless insects," the document says.

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