Mo. Rev. Stat. § 26.140: Identification cards for consular officers — vehicle identification plates — unauthorized use a misdemeanor.

Whenever any consular officer shall have registered as such with the Department of State of the United States and has been issued an* exequatur or a diplomatic note by the Department of State, the governor shall issue or cause to be issued to such consular officer an identification card with a short statement of his rights and privileges as such, identifying him as a consular officer for the country he represents. "Consular officers" , as used in this section, shall be deemed to include consuls general, consuls, vice consuls, consular agents, honorary consuls and none other. Such consular officers are authorized to use a motor vehicle identification plate identifying him as an official consular officer. Any person other than a consular officer using such vehicle identification plate shall be guilty of a misdemeanor.