Cards that have been tampered with are distorted. If an image does not appear, then the card is counterfeit. ConSyGen has successfully verified this with cards seized by an international credit card company. First, traveler's checks will glow if counterfeit, and the paper will appear dull if genuine, just like currency. Finally, most traveler's checks have watermarks when viewed with the platform light.
Most international currencies have security threads, holograms, and watermarks.
If a check has been duplicated, the security features will be missing. State Issued Driver's Licenses Many state issued driver's licenses and identification cards have the seal of that particular state on the upper portion of the card extending above the card portion itself into the clear lamination. If a card is opened and a new picture inserted, the re-lamination would not be duplicated easy. The fluorescent ink is engrained in the laminated portion itself and only visible under the light. The newer plastic magnetic stripe cards also contain distinct holograms.