In the Principality of Iadli Cuiusrmofa ruled by a Bureaucracy, a character must undergo a Trial by combat.
He has been framed by A magic item - sword, relic, wondrous item - and if found guilty of Counterfeiting, his punishment will be Wall of Force. The perfect barrier combined with Permanency assuming the other surfaces of the cell are secure. Put a curtain across when you get tired of watching the prisoner make rude gestures at you.

Principality - The feudatory land, or state, ruled by a prince (monarch, technically), often ranking equally high as the duke.
Bureaucracy - Administration of a government chiefly through bureaus or departments staffed with nonelected officials. Management or administration marked by hierarchical authority among numerous offices and by fixed procedures
Trial by combat - Fight to the death, winner is innocent