RFID is becoming the "new thing". I can also see drivers' licenses having these so all the cop needs to do is pull you over, scan the license and have your complete history instead of having to go back to the car and research it. Heck - RFID might even be on license plates so the cop knows all about you before he/she exits the vehicle.
And, for the conspiracy theorists, it would be available to all online to read their own history so if you had something on your record that wasn't cleared, you could challenge that.