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Sands (see previous comment) specified the Holder confirmation hearing. He says that Holder should be asked if waterboarding is torture. If Holder is unequivocal in saying it is, then that will be a sign that some form of investigation is on tap.
But if he fudges on it a la Mukasey/Gonzo, it will be up to other nations to take it up. He mentioned Pinochet as an example of how this could work.