Document authentication is a public administration service confirming the existence of an original document. The authentication officer is legally obliged to recognize the original document through an authentication element (Act No. 21/2006 Coll. and Article 73 of Act No. 358/1992 Coll., Notarial Code) and to recognize an obvious forgery (Supreme Court of the Czech Republic 30 Cdo 1966/2013). To test the functionality of authentication, we conducted an experiment in which we managed to obtain an obviously dubious document authenticated in 77 % cases. Since the authenticated copy contains a clause of authenticity, it is difficult to prove a forgery. The surprising results of the experiment were published in the journal “Státní zastupitelství” but also presented in the interview “Výzva Jiřího Kubíka”. The experiment attracted widespread media attention.