Read three posts back for a description of TSA policies. I pay fairly close attention to this issue, and as stated above, best I (and I think most people) can tell, there is no requirement that you present any documentation other than your boarding pass in order to get past a TSA airport barricade. Doing so just allows you through with less scrutiny. As long as you're not carrying any weapons, explosives, or incendiaries, you should be fine. If you want to sneak any of those through, you're going to be way better off if you show some documentation of your identity.