These files were part of a massive trove of secret documents leaked last year to the anti-secrecy website Wikileaks. They were made available to The New York Times by another source on condition of anonymity and shared with NPR.
NPR has redacted the documents posted on NPR.org to conceal the identity of informants and identifiers that would identify methodology used by intelligence agencies. All coded references in footnotes have been removed. Names and identifying numbers of many informants have been concealed. References to testimony by widely known detainees such as Abu Zubaydah, Khalid Sheikh Mohammed and Mohammed Basardah have been retained.