Zubaydah has never been formally charged with a crime during his 14 years in custody. He appeared before a periodic review board at Guantanamo that determines whether detainees remain terrorist ...

Zubaydah was waterboarded as often as twice a day over the following weeks. Even some CIA veterans at the Thai prison were horrified by the scene, according to the Senate report.

While no longer describing Zubaydah as "al-Qaida's chief of operations" — as President George W. Bush did in 2002 — an unclassified profile of the detainee insists that he "played a key role in ...