The release last week of Bush-era legal memoranda justifying the Central Intelligence Agency’s use of extreme interrogation methods has opened a window on what former Vice President Dick Cheney famously called “the dark side” of the war on terrorism. But despite President Obama’s declaration that releasing the four Justice Department memos disclosed Friday would end “a dark and painful chapter in our history,” at least one other memorandum on CIA interrogations remains undisclosed: a 2007 opinion from the Justice Department’s Office of Legal Counsel on what a new interpretation of the Geneva Conventions’ Common Article 3 meant for the agency’s “enhanced interrogation program.”...

“The CIA still seems to want to get authority to interrogate people outside of what would be found to be a violation of the Geneva Conventions and the law,” said Michael Ratner, president of the Center for Constitutional Rights, who cautioned that he had not previously known about the 2007 memorandum.