Mo. Rev. Stat. § 269.050

Upon receipt of a permit application, the state veterinarian shall, within thirty days, ascertain whether or not such applicant is qualified to operate such vehicle or substation, and that if the equipment or substation to be used and the proposed methods of operation comply with all the provisions of this chapter and with the rules and regulations authorized thereunder, the state veterinarian shall thereupon issue to such applicant a * permit.