While there was no "smoking gun" amid the stack of documents Arrigo gave me, my reporting eventually led me to an even graver discovery. After a 10-month investigation comprising more than 70 interviews as well as a detailed review of public and confidential documents, I pieced together the account of the Abu Zubaydah interrogation that appears in this article. I also discovered that psychologists weren't merely complicit in America's aggressive new interrogation regime. Psychologists, working in secrecy, had actually designed the tactics and trained interrogators in them while on contract to the C.I.A.

Two psychologists in particular played a central role: James Elmer Mitchell, who was attached to the C.I.A. team that eventually arrived in Thailand, and his colleague Bruce Jessen. Neither served on the task force or are A.P.A. members. Both worked in a classified military training program known as sere—for Survival, Evasion, Resistance, Escape—which trains soldiers to endure captivity in enemy hands. Mitchell and Jessen reverse-engineered the tactics inflicted on sere trainees for use on detainees in the global war on terror, according to psychologists and others with direct knowledge of their activities. The C.I.A. put them in charge of training interrogators in the brutal techniques, including "waterboarding," at its network of "black sites." In a statement, Mitchell and Jessen said, "We are proud of the work we have done for our country."

The agency had famously little experience in conducting interrogations or in eliciting "ticking time bomb" information from detainees. Yet, remarkably, it turned to Mitchell and Jessen, who were equally inexperienced and had no proof of their tactics' effectiveness, say several of their former colleagues. Steve Kleinman, an Air Force Reserve colonel and expert in human-intelligence operations, says he finds it astonishing that the C.I.A. "chose two clinical psychologists who had no intelligence background whatsoever, who had never conducted an interrogation … to do something that had never been proven in the real world."

The tactics were a "voodoo science," says Michael Rolince, section chief of the F.B.I.'s International Terrorism Operations. According to a person familiar with the methods, the basic approach was to "break down [the detainees] through isolation, white noise, completely take away their ability to predict the future, create dependence on interrogators."
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