[Wonder Warthog]

"The point I will get worried is when they start requiring RFID so that your license can be "checked" without you ever knowing it has been scanned."

Simple piece of aluminum foil, 2X the size of the license. Fold once. Problem solved.

[KarlInOhio]

Simple piece of aluminum foil, 2X the size of the license. Fold once. Problem solved.

I doubt that will completely stop all signals, but rather just attenuate them by a certain amount thus shortening the range at which it can be detected. Maybe you can shorten the range enough so that they have to be inside your pocket to detect it in your wallet. I would rather have something like a small drill and a drop of acid to kill the RFID chip or antenna.