You sure used to subscribe to such a hare-brained theory when you were DCing it.
As I recall you've started numerous discussions advocating the "a calorie is a calorie" theory, so based on that concept at its purest, one could consume 2 or 3 grams of protein per lb per day as long as carb and fat grams aren't high enough to induce a caloric surplus.
Besides, like somebody said, as long as your kidneys are already healthy and you're drinking a gallon of water a day, there aren't much in the way of proven side effects of "protein overdose", at least I've never been able to find a study that proved it. If anybody knows of one though I'm all ears.