If the criminal trial is aimed simply at ascertaining the truth of a criminal charge, it is inherently problematic to prevent the prosecution from adducing relevant evidence on the ground of its unlawful provenance. This article challenges the starting premise by replacing the epistemic focus with a political perspective. It offers a normative justification for the exclusion of unlawfully obtained evidence that is rooted in a theory of the criminal trial as a process of holding the executive to the rule (...) of law. On this theory, it is the admission rather than exclusion of such evidence that is inherently problematic. The differences between this theory and others that are in currency will be noted, as will its implications and limitations. (shrink)