■ Interrogators stepped up their use of waterboarding beyond the simulated drowning tactics authorized by lawyers. Even after interrogators believed terrorism suspect Abu Zubaydah to be cooperative, CIA officials at headquarters pressured them to keep waterboarding.
■ Capturing and interrogating terrorism suspects helped warn officials of terrorist plots and provided important intelligence, but “measuring the effectiveness of waterboarding and other extreme tactics is a more subjective process and not without some concern.’’
■ Interrogators conducted at least one mock execution to try to scare a prisoner into talking. Mock executions are a violation of US antitorture laws.
■ While questioning Abd al-Nashiri, a suspect in the 2000 USS Cole bombing, an interrogator hinted that officials would sexually assault al-Nashiri’s mother in front of him and pretended to be a member of a Middle East intelligence agency that is believed to use such a tactic.
■ Some CIA officials said the agency had limited intelligence on Al Qaeda and very little understanding about what senior leaders knew, so interrogators could only speculate about what a detainee “should know.’’