From Scott Shane, David Johnston and James Risen at the NY Times:

WASHINGTON, Oct. 3 — When the Justice Department publicly declared torture “abhorrent” in a legal opinion in December 2004, the Bush administration appeared to have abandoned its assertion of nearly unlimited presidential authority to order brutal interrogations.

But soon after Alberto R. Gonzales’s arrival as attorney general in February 2005, the Justice Department issued another opinion, this one in secret. It was a very different document, according to officials briefed on it, an expansive endorsement of the harshest interrogation techniques ever used by the Central Intelligence Agency.

The new opinion, the officials said, for the first time provided explicit authorization to barrage terror suspects with a combination of painful physical and psychological tactics, including head-slapping, simulated drowning and frigid temperatures.

Mr. Gonzales approved the legal memorandum on “combined effects” over the objections of James B. Comey, the deputy attorney general, who was leaving his job after bruising clashes with the White House. Disagreeing with what he viewed as the opinion’s overreaching legal reasoning, Mr. Comey told colleagues at the department that they would all be “ashamed” when the world eventually learned of it.

Later that year, as Congress moved toward outlawing “cruel, inhuman and degrading” treatment, the Justice Department issued another secret opinion, one most lawmakers did not know existed, current and former officials said. The Justice Department document declared that none of the C.I.A. interrogation methods violated that standard.

It appears the torture methods came from countries known for their brutal governments:

The Bush administration had entered uncharted legal territory beginning in 2002, holding prisoners outside the scrutiny of the International Red Cross and subjecting them to harrowing pressure tactics. They included slaps to the head; hours held naked in a frigid cell; days and nights without sleep while battered by thundering rock music; long periods manacled in stress positions; or the ultimate, waterboarding.

Never in history had the United States authorized such tactics. While President Bush and C.I.A. officials would later insist that the harsh measures produced crucial intelligence, many veteran interrogators, psychologists and other experts say that less coercive methods are equally or more effective.

With virtually no experience in interrogations, the C.I.A. had constructed its program in a few harried months by consulting Egyptian and Saudi intelligence officials and copying Soviet interrogation methods long used in training American servicemen to withstand capture.

What’s next? Chopping off hands? Beheadings? Forced labor camps? That’s a nice group of mentors, reviled internationally. In fact, Al Qaida’s second in command (al-Zawahiri) was permanently radicalized after being tortured in Egypt’s prisons.

The only intelligence that has been disclosed offering any ‘proof’ about the value of the torture is the information gained from Khalid Sheikh Mohammed, the alleged chief planner of the Sept. 11 attacks:

Former intelligence officials, for the first time, disclosed that a variety of tough interrogation tactics were used about 100 times over two weeks on Mr. Mohammed. Agency officials then ordered a halt, fearing the combined assault might have amounted to illegal torture. A C.I.A. spokesman, George Little, declined to discuss the handling of Mr. Mohammed. Mr. Little said the program “has been conducted lawfully, with great care and close review” and “has helped our country disrupt terrorist plots and save innocent lives.”

“The agency has always sought a clear legal framework, conducting the program in strict accord with U.S. law, and protecting the officers who go face-to-face with ruthless terrorists,” Mr. Little added.

Some intelligence officers say that many of Mr. Mohammed’s statements proved exaggerated or false. One problem, a former senior agency official said, was that the C.I.A.’s initial interrogators were not experts on Mr. Mohammed’s background or Al Qaeda, and it took about a month to get such an expert to the secret prison. The former official said many C.I.A. professionals now believe patient, repeated questioning by well-informed experts is more effective than harsh physical pressure.

Other intelligence officers, including Mr. Kelbaugh, insist that the harsh treatment produced invaluable insights into Al Qaeda’s structure and plans.

“We leaned in pretty hard on K.S.M.,” Mr. Kelbaugh said, referring to Mr. Mohammed. “We were getting good information, and then they were told: ‘Slow it down. It may not be correct. Wait for some legal clarification.’”

The doubts at the C.I.A. proved prophetic. In late 2003, after Mr. Yoo left the Justice Department, the new head of the Office of Legal Counsel, Jack Goldsmith, began reviewing his work, which he found deeply flawed. Mr. Goldsmith infuriated White House officials, first by rejecting part of the National Security Agency’s surveillance program, prompting the threat of mass resignations by top Justice Department officials, including Mr. Ashcroft and Mr. Comey, and a showdown at the attorney general’s hospital bedside.

Then, in June 2004, Mr. Goldsmith formally withdrew the August 2002 Yoo memorandum on interrogation, which he found overreaching and poorly reasoned. Mr. Goldsmith, who left the Justice Department soon afterward, first spoke at length about his dissenting views to The New York Times last month, testified before the Senate Judiciary Committee on Tuesday.

Despite trying to select officials they could count on to provide supporting opinions permitting torture, they occasionally found themselves blocked by principled legal analysis:

Under Mr. Ashcroft, Mr. Comey’s opposition might have killed the opinion. An imposing former prosecutor and self-described conservative who stands 6-foot-8, he was the rare administration official who was willing to confront Mr. Addington. At one testy 2004 White House meeting, when Mr. Comey stated that “no lawyer” would endorse Mr. Yoo’s justification for the N.S.A. program, Mr. Addington demurred, saying he was a lawyer and found it convincing. Mr. Comey shot back: “No good lawyer,” according to someone pre