I'm fairly certain that there are laws concerning emergency room visits and life threatening injuries in every state.
I agree that this was a bad scene, but you also have to look at it from the hospital's eyes. What if you were simply someone harboring a kidnapped child? They have no idea without proper documentation, and perhaps they didn't delay you for this purpose, but I can see questions arrising when you have a differnet name.
I would absolutely take Justin's advise and check to see what sort of policy the school has for such an instance.
I know many here, as well as you, are probably boiling over this matter, but thank God your son is fine and remember that the suits others have filed in the past are partly to blame for the problems that exist.
The way I see it, unless you absolutely deserve compensation, it would be better to put energy towords policy change with legislators rather than to sue.