The permit has the photograph of the disabled driver or passenger as the case may be on it. ( on the side normally turned INTO the car, not out to the window ). If checked by an appropriate authority, presumably the photo should be checked with the occupant(s) to see if the holder is in fact in the car. However in some 10 or more years of holding such a permit, my relative has never been asked to show the permit or been questioned on it's use.