particularly true in the case of fake ID cards that combine many functions in one document, and for documents which are issued in large numbers, thus requiring many thousands of people to have authorizing powers, thus creating a longer chain of people who can possibly be exploited. Detection of a "genuine fake" document is also a difficult process; as such a fake is a legitimate document, it will pass any tests for forgery. To detect such fakes, it is necessary to perform a background check on the individual in question to confirm the legitimacy of the document's information. See also ID card printer Outline of forgery References Security engineering Document forgery