The New Yorker's Jane Mayer on how a suspect at Iraq's notorious Abu Ghraib prison died while undergoing an interrogation by the CIA.

Some excerpts:

At the end of a secluded cul-de-sac, in a fast-growing Virginia suburb favored by employees of the Central Intelligence Agency, is a handsome replica of an old-fashioned farmhouse, with a white-railed front porch. The large back yard has a swimming pool, which, on a recent October afternoon, was neatly covered. In the driveway were two cars, a late-model truck, and an all-terrain vehicle. The sole discordant note was struck by a faded American flag on the porch; instead of fluttering in the autumn breeze, it was folded on a heap of old Christmas ornaments.

The house belongs to Mark Swanner, a forty-six-year-old C.I.A. officer who has performed interrogations and polygraph tests for the agency, which has employed him at least since the nineteen-nineties. (He is not a covert operative.) Two years ago, at Abu Ghraib prison, outside Baghdad, an Iraqi prisoner in Swanner’s custody, Manadel al-Jamadi, died during an interrogation. His head had been covered with a plastic bag, and he was shackled in a crucifixion-like pose that inhibited his ability to breathe; according to forensic pathologists who have examined the case, he asphyxiated. In a subsequent internal investigation, United States government authorities classified Jamadi’s death as a “homicide,” meaning that it resulted from unnatural causes. Swanner has not been charged with a crime and continues to work for the agency.

After September 11th, the Justice Department fashioned secret legal guidelines that appear to indemnify C.I.A. officials who perform aggressive, even violent interrogations outside the United States. Techniques such as waterboarding—the near-drowning of a suspect—have been implicitly authorized by an Administration that feels that such methods may be necessary to win the war on terrorism. (In 2001, Vice-President Dick Cheney, in an interview on “Meet the Press,” said that the government might have to go to “the dark side” in handling terrorist suspects, adding, “It’s going to be vital for us to use any means at our disposal.”) The harsh treatment of Jamadi and other prisoners in C.I.A. custody, however, has inspired an emotional debate in Washington, raising questions about what limits should be placed on agency officials who interrogate foreign terrorist suspects outside U.S. territory. ...

The C.I.A. has reportedly been implicated in at least four deaths of detainees in Afghanistan and Iraq, including that of Jamadi, and has referred eight potentially criminal cases involving abuse and misconduct to the Justice Department. In March, Goss, the C.I.A.’s director, testified before Congress that “we don’t do torture,” and the agency’s press office issued a release stating, “All approved interrogation techniques, both past and present, are lawful and do not constitute torture. . . . C.I.A. policies on interrogation have always followed legal guidance from the Department of Justice. If an individual violates the policy, then he or she will be held accountable.”

Yet the government has brought charges against only one person affiliated with the agency: David Passaro, a low-level contract employee, not a full-fledged C.I.A. officer. In 2003, Passaro, while interrogating an Afghan prisoner, allegedly beat him with a flashlight so severely that he eventually died from his injuries. In two other incidents of prisoner abuse, the Times reported last month, charges probably will not be brought against C.I.A. personnel: the 2003 case of an Iraqi prisoner who was forced head first into a sleeping bag, then beaten; and the 2002 abuse of an Afghan prisoner who froze to death after being stripped and chained to the floor of a concrete cell. (The C.I.A. supervisor involved in the latter case was subsequently promoted.)

One reason these C.I.A. officials may not be facing charges is that, in recent years, the Justice Department has established a strikingly narrow definition of torture. In August, 2002, the department’s Office of Legal Counsel sent a memo on interrogations to the White House, which argued that a coercive technique was torture only when it induced pain equivalent to what a person experiencing death or organ failure might suffer. By implication, all lesser forms of physical and psychological mistreatment—what critics have called “torture lite”—were legal. The memo also said that torture was illegal only when it could be proved that the interrogator intended to cause the required level of pain. And it provided interrogators with another large exemption: torture might be acceptable if an interrogator was acting in accordance with military “necessity.” A source familiar with the memo’s origins, who declined to speak on the record, said that it “was written as an immunity, a blank check.” In 2004, the “torture memo,” as it became known, was leaked, complicating the nomination of Alberto R. Gonzales to be Attorney General; as White House counsel, Gonzales had approved the memo. The Administration subsequently revised the guidelines, using language that seemed more restrictive. But a little-noticed footnote protected the coercive methods permitted by the “torture memo,” stating that they did not violate the “standards set forth in this memorandum.”

The Bush Administration has resisted disclosing the contents of two Justice Department memos that established a detailed interrogation policy for the Pentagon and the C.I.A. A March, 2003, classified memo was “breathtaking,” the same source said. The document dismissed virtually all national and international laws regulating the treatment of prisoners, including war-crimes and assault statutes, and it was radical in its view that in wartime the President can fight enemies by whatever means he sees fit. According to the memo, Congress has no constitutional right to interfere with the President in his role as Commander-in-Chief, including making laws that limit the ways in which prisoners may be interrogated. Another classified Justice Department memo, issued in August, 2002, is said to authorize numerous “enhanced” interrogation techniques for the C.I.A. These two memos sanction such extreme measures that, even if the agency wanted to discipline or prosecute agents who stray beyond its own comfort level, the legal tools to do so may no longer exist. Like the torture memo, these documents are believed to have been signed by Jay Bybee, the former head of the Office of Legal Counsel, but written by a Justice Department lawyer, John Yoo, who is now a professor of law at Berkeley.