Mo. Rev. Stat. § 40.380: Leaving post while on duty — use of drugs, drunkenness, sleeping on duty — court-martial.

Any person subject to sections 40.005 to 40.490 who is found drunk, under the influence of any intoxicant, narcotic, barbiturate or somnifacient or similar substance, on duty or sleeping upon his post, or who leaves that post before he is regularly relieved, shall be punished as a court-martial may direct.