Mo. Rev. Stat. § 476.500
476.500 Acceptance by judge — procedure.
476.500. Acceptance by judge — procedure. — Any person who desires to accept the provisions of sections 476.450 to 476.510 shall notify the governor in writing of such fact; and if he be qualified the governor shall certify such fact to the commissioner of administration and state auditor and to the chief justice of the supreme court.
(L. 1951 p. 442 § 6)