As other have pointed out, now that waterboarding has been definitively proven by the Bush administration to be an interrogation technique, and not torture, it should now also be available to use it to interrogate criminals in general, not just "enemy combatants". Imagine the awesome crimefighting tool that our police will soon have at their disposal. For example, lets say the police have reason to believe that a man is selling drugs, but they can't get any evidence of that, but feel his mother would have information that might be incriminating. She could be asked a few questions regarding this, and if she fails to provide the incriminating information the police need, we could step up the interrogation with a little waterboarding, and I am sure she will soon remember everything the police want her to remember. There is nothing morally wrong with this, if waterboarding is simply interrogation.
Imagine how simple an IRS audit could become if IRS agents are allowed to waterboard taxpayers suspected of cheating on their taxes. You would see tax compliance rates soar to new highs in no time. We would save millions of dollars because our government would not have to conduct long, drawn out audits and investigations.