Mo. Rev. Stat. § 99.170
An authority may submit to the state auditor any bonds to be issued hereunder after all proceedings for the issuance of such bonds have been taken. Upon the submission of such proceedings to the state auditor, it shall be his duty to examine into and pass upon the validity of such bonds and the regularity of all proceedings in connection therewith. If such proceedings conform to the provisions of sections 99.010 to 99.230 and are otherwise regular in form and if such bonds when delivered and paid for will constitute binding and legal obligations of the authority enforceable according to the terms thereof, the state auditor shall certify in substance upon the back of each of said bonds that it is issued in accordance with the constitution and laws of the state of Missouri.
§ 99.170, RSMo