In the end, it is by the quality of that evidence, and the clarity with which it is conveyed, that this trial should be judged. The result is irrelevant: Quite frankly, it doesn't matter whether Saddam Hussein is drawn and quartered, exiled to Pyongyang, or left to rot in a Baghdad prison. No punishment could make up for the thousands he killed, or for the terror he inflicted on his country.
But if his Sunni countrymen learn what he did to Shiites and Kurds, if the Shiites and Kurds learn what he did to Sunnis, if Iraqis come to realize that his system of totalitarian terror damaged them all, and if others in the Middle East learn that dictatorships can be overthrown, then the trial will have served its purpose. That, and not an arbitrary standard of international law, is how the success of this unusual tribunal should be measured.