Mo. Rev. Stat. § 477.081
From January 1, 1972, no new commissioner shall be appointed by the supreme court or the court of appeals. All commissioners serving on January 1, 1972, are eligible for reappointment for additional four-year terms until they reach compulsory retirement age, or die, resign or are removed. Each commissioner shall possess the same qualifications, take and subscribe a like oath, and receive the same compensation payable in the same manner as judges of the court appointing them. The commissioners are subject to the rules and orders of the court appointing them and shall provide such services as the court may require.
(L. 1971 S.B. 117 § 1, A.L. 1972 S.B. 485)