Defenders of these techniques have claimed that they got Abu Zubaydah to give up information leading to the capture of Ramzi bin al-Shibh, a top aide to Khalid Shaikh Mohammed, and Mr. Padilla. This is false. The information that led to Mr. Shibh’s capture came primarily from a different terrorist operative who was interviewed using traditional methods. As for Mr. Padilla, the dates just don’t add up: the harsh techniques were approved in the memo of August 2002, Mr. Padilla had been arrested that May.

CIA interrogators used waterboarding at least 266 times on two top al Qaeda suspects, according to a Bush-era Justice Department memo released by the Obama administration.