It's that asterisk that's the problem.
To find out why, read the must-read New York Times op-ed by the Air Force colonel who used to be Chief Prosecutor for the military commissions at Guantánamo. That colonel, Morris Davis, explains that he resigned when superiors overruled his decision that confessions extracted by means of waterboarding would not be adduced at Gitmo trials. His successors won't rule out introduction of such evidence.
What's more, it's been disclosed that the Pentagon sent in a so-called "Clean Team," which gave detainees who'd suffered coercion during initial interrogations food and coffee in an effort to get new, untainted confessions. (Have they read Wong Sun?)
To paraphrase Col. Davis:
Why do stuff like that?