Reason for denial is a stamp required to accompany all denials since day 18 after unfavorable international press affects Arstotzkan immigration protocol. The text on the stamp never changes and is illegible. As the stamp has wiring going to it, one can assume it is a machine-processed answer generated when the inspector finds a discrepancy.
The stamp becomes available when an entrant is interrogated for the first time and remains available until the entrant leaves the booth, even if they clarify discrepancies sufficiently. When denying entry, both denied and reason for denial must be stamped on a passport or an otherwise legitimate denial will lead to the citation "Denial reason not given." It is possible to stamp a reason for denial and an entry approval on the same passport and let the entrant in. This does not lead to a citation if the person is clear for entry.