The report indicates that Mr. Haynes was an early proponent of the idea of using the agency that trains soldiers to withstand torture to devise plans for the interrogation of prisoners held by the American military. These trainers  who are not interrogators but experts only on how physical and mental pain is inflicted and may be endured  were sent to work with interrogators in Afghanistan, in Guantánamo and in Iraq.

On Dec. 2, 2002, Mr. Rumsfeld authorized the interrogators at Guantánamo to use a range of abusive techniques that were already widespread in Afghanistan, enshrining them as official policy. Instead of a painstaking legal review, Mr. Rumsfeld based that authorization on a one-page memo from Mr. Haynes. The Senate panel noted that senior military lawyers considered the memo “ ‘legally insufficient’ and ‘woefully inadequate.’ ”

Mr. Rumsfeld rescinded his order a month later, and narrowed the number of “aggressive techniques” that could be used at Guantánamo. But he did so only after the Navy’s chief lawyer threatened to formally protest the illegal treatment of prisoners. By then, at least one prisoner, Mohammed al-Qahtani, had been threatened with military dogs, deprived of sleep for weeks, stripped naked and made to wear a leash and perform dog tricks. This year, a military tribunal at Guantánamo dismissed the charges against Mr. Qahtani.

The abuse and torture of prisoners continued at prisons run by the C.I.A. and specialists from the torture-resistance program remained involved in the military detention system until 2004. Some of the practices Mr. Rumsfeld left in place seem illegal, like prolonged sleep deprivation.

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These policies have deeply harmed America’s image as a nation of laws and may make it impossible to bring dangerous men to real justice. The report said the interrogation techniques were ineffective, despite the administration’s repeated claims to the contrary.

Alberto Mora, the former Navy general counsel who protested the abuses, told the Senate committee that “there are serving U.S. flag-rank officers who maintain that the first and second identifiable causes of U.S. combat deaths in Iraq  as judged by their effectiveness in recruiting insurgent fighters into combat  are, respectively, the symbols of Abu Ghraib and Guantánamo.”

We can understand that Americans may be eager to put these dark chapters behind them, but it would be irresponsible for the nation and a new administration to ignore what has happened  and may still be happening in secret C.I.A. prisons that are not covered by the military’s current ban on activities like waterboarding.