Mo. Rev. Stat. § 476.686
Notwithstanding any other law to the contrary, any person who has reached the age of sixty-five years and has served, but is not serving on August 28, 1992, as a magistrate judge in a city not within a county and has not received creditable service in the judges' retirement system for such service, shall be made, constituted, appointed, and employed by the judges' retirement system as a special consultant on the problems of retirement, aging and other state matters for the remainder of the person's life. As compensation for such employment, the person shall receive creditable service in the judges' retirement system for the time that person served as a magistrate judge and be entitled to any benefits provided by sections 476.450 to 476.683 that are applicable.
§ 476.686, RSMo