Your Money's No Good Here, Mr. President

I saw President Jimmy Carter on TV and a thought crossed my mind: Does it say "President Jimmy Carter" on his credit card? or his checks? or his driver liscense?
But then I thought he probably doesn't even need a credit card, or checking acccount. If you are a former U.S. President, would you need to pay for anything, ever? Couldn't you just go to the store, pick out a few items, like a coffee table, maybe a DVD player, maybe a a few plants. When it's time to pay just smile at the manager, shrug and say "Hey, I'm a former U.S. president!" Then load up your truck and head on home?

Of course, that same former President could use this power for evil. Let's say after loading up his truck full of presidential goods, he drives that truck home, falls asleep at the wheel, veers off and kills a drifter. Then when the cops come to the scene wanting to arrest him for vehicular manslaughter he could smile at the detective, shrug and say "Hey, I'm a former U.S. president!"
And he would be let off the hook.

Man, I want to be a former U.S. president!