nulla poena sine lege

nulla poena sine lege

From Latin, literally, "no penalty without law," a legal principle that a person cannot be punished for an action if that action is not prohibited by law. The company's lawyers successfully argued that their tax practices, however unsavory to the government, were not expressly prohibited by existing laws, and therefore the case against them should be thrown out on the principle of nulla poena sine lege.
See also: nulla, sine
Farlex Dictionary of Idioms.
See also:
  • sine
  • take action
  • while you are at it
  • (something) is not going to (do something) itself
  • damned if I do, damned if I don't
  • damned if you do, damned if you don't
  • I'm damned if I do and damned if I don't
  • when in doubt, do nothing
  • action stations
  • an act of war