Nulla poena sine lege
Nulla poena sine lege (Latin for "no penalty without law", Anglicized pronunciation: NUL-ə PEE-nə SY-nee LEE-jee) is a legal formula which, in its narrow interpretation, states that one can only be punished for doing something if a penalty for this behavior is fixed in criminal law. As some laws are unwritten (e.g.