The Mistake of the Machine (The Father Brown Classics, Episode 17)

The Mistake of the Machine is a short story by Gilbert Keith Chesterton: Flambeau and his friend the priest were sitting in the Temple Gardens about sunset; and their neighbourhood or some such accidental influence had turned their talk to matters of legal process. From the problem of the licence in cross-examination, their talk strayed to Roman and mediaeval torture, to the examining magistrate in France and the Third Degree in America.