Fraudsters use many techniques to forge a document, and photo manipulation or replacement is not a rare one. For instance, they can morph a new picture and attach it to a valid document. The options are numerous, but they are generally related to visible primary portraits.
However, the absolute majority of identity documents currently have secondary and/or “ghost” photos that may or may not be visible to the naked eye. Such additional portraits are added to documents in RFID chips that are read with NFC technology, in kinegrams, in lenticular images, or just placed anywhere and visualised under special lights (ultra-violet, for example).
