Mo. Rev. Stat. § 40.385
Fighting — promoting a fight or duel, failure to report — court-martial.
40.385. Fighting — promoting a fight or duel, failure to report — court-martial. — Any person subject to sections 40.005 to 40.490 who fights or promotes, or is concerned in or connives at fighting a duel, or who, having knowledge of a challenge sent or about to be sent, fails to report the fact promptly to the proper authority, shall be punished as a court-martial may direct.
(L. 1984 H.B. 1035 § 112)