Carl is checking IDs at the door. Which of these would alert him to a counterfeit ID?

Every state-issued ID has some type of information or marking on the back, including bar codes, magnetic stripes, donor information, and license restrictions. For added security, many states add a lighter “ghost” photo to the front that matches the original photo on the picture, and some add holograms or special images that can only be seen when the ID is held at an angle.