Missouri Revised Statutes Title X. Taxation and Revenue § 150.450. Enforcement of law

The informing or prosecuting officer of the counties and municipal corporations in this state shall enforce the provisions of this law, and prosecute violations thereof. Such officers may demand the production of the proper state license from an itinerant vendor advertising or actually engaged in business, and a failure to produce such license shall be prima facie evidence against such vendor that he has none.