遡そ及きゅう法ほう

noun

retroactive law; retrospective law

Legal term for a law that applies to events before its enactment. Used in constitutional and criminal law contexts.

• 憲けん法ぽうは遡そ及きゅう法ほうを原げん則そくとして禁きん止ししている。

  The constitution generally prohibits retroactive laws.