Mo. Rev. Stat. § 50.790
It shall hereafter be unlawful for the commissioners of the county commission of any county of this state to which sections 50.760 to 50.790 apply to draw, or authorize the drawing of, any check or county warrant, or other order for the payment of money for any supplies for any county officer for which an order or requisition has not first been obtained as in sections 50.760 to 50.790 required. Whosoever shall violate the provisions of this law shall be deemed guilty of a misdemeanor and upon conviction thereof shall be punished by a fine of not less than fifty dollars nor more than one thousand dollars, or by imprisonment in the county jail for a term of not less than thirty days nor more than one year, or by both such fine and imprisonment; provided, that if any such commissioner shall be absent at the time, or shall cause his protest against such action to be entered in the minutes of the commission, when any violation of this law is ordered by the other commissioners of such commission, he shall not be deemed to have violated the provisions of this law.
§ 50.790, RSMo