Boyce Motor Lines v. United States

The Interstate Commerce Commission (ICC) required drivers hauling certain hazardous materials to avoid congested areas "so far as practicable, and, where feasible, by prearrangement of routes," with knowing violations subject to criminal penalties under the authorizing statute; the regulation traced its roots back to 1866. Boyce Motor Lines (Boyce) (defendant) was indicted for violating the regulation. The district court dismissed the charges, finding the "so far as practicable, and, where feasible" language unconstitutionally vague, but the Third Circuit reversed, and the Supreme Court granted certiorari.