DEAD LETTER
dead letter. 1. A law or practice that, although not formally abolished, is no longer used,
observed, or enforced. 2. A piece of mail that can be neither delivered nor returned because it lacks
correct addresses for both the intended recipient and the sender. [Cases: Postal Service 24.C.J.S.
Postal Service and Offenses Against Postal Laws § 20.] [Blacks Law 8th]