Mo. Rev. Stat. § 196.230
The director of the department of health and senior services and his assistants or agents by him appointed, the state, county, city and town health officers shall have full power at any time to enter and inspect every building, room, basement or cellar, occupied or used, or suspected of being used, for the production for sale, manufacture for sale, storage, sale, distribution or transportation of food and all utensils, fixtures, furniture and machinery used as aforesaid, and if upon inspection any food producing or distributing establishment, conveyance, employer, operative, employee, clerk, driver or other person is found to be violating any of the provisions of sections 196.190 to 196.265, or if the production, cooking, preparation, manufacture, packing, storing, sale, distribution or transportation of food is being conducted in a manner detrimental to the health of the employees and operatives and the character or quality of the food therein being produced, manufactured, packed, stored, sold, distributed or conveyed, the officer or inspector, making the examination or inspection, shall furnish evidence of said violation to the prosecuting attorney of the county in which the violation occurs, and it shall be the duty of all prosecuting attorneys to represent and prosecute, in behalf of the people, when called upon by the director of the department of health and senior services to do so, all such cases of offenses arising under the provisions of sections 196.190 to 196.265. When complaint is made by the said director of the department of health and senior services, security for costs shall not be required of the complainant in any case at any time of the prosecution or trial.
§ 196.230, RSMo