Mo. Rev. Stat. § 330.090
Any person licensed to practice podiatry in this state who has retired or may hereafter retire from such practice shall not be required to register as required by this chapter, provided such person shall file with the board an affidavit which states the date on which the person retired from the practice of podiatry and such other facts as shall tend to verify the person's retirement as the board deems necessary; provided, however, that if such person thereafter reengage in the practice of podiatry, the person shall register with the board as provided by this chapter.
(L. 1945 p. 965 § 9798d, A.L. 1981 S.B. 16, A.L. 1995 S.B. 69, et al.)