Mo. Rev. Stat. § 328.090
Any person desiring to teach barbering in this state in a barber school, college or barber shop must first possess a license to practice the occupation of barbering and make application to the board for an examination as a teacher or instructor in said occupation and shall pay the required instructor examination fee. The board shall examine such applicant and after finding that he or she is duly qualified to teach said occupation, the board shall issue to him or her a license entitling him or her to teach barbering in this state, subject to all the provisions of this chapter. Holders of licenses to teach barbering shall, on or before the expiration of their respective licenses, make application for the renewal of same, and shall in each case pay the instructor renewal fee. Should any person holding a license to teach barbering fail to renew same within the time prescribed herein, such person shall be required to pay a reinstatement fee in addition to the regular license fee provided for herein. Any person failing to renew his or her license to teach barbering for a period not exceeding two years may reinstate said license upon the payment of the renewal fee in addition to the reinstatement fee, but any person failing to renew his or her license to teach barbering for a period exceeding two years and desiring to be licensed as a teacher of barbering in this state will be required to pass a satisfactory examination as to his or her qualifications to teach barbering and shall pay the instructor examination fee.
§ 328.090, RSMo
RSMo 1939 § 10133, A.L. 1947 V. I p. 218, A. 1949 H.B. 2068, A.L. 1951 p. 740, A.L. 1981 S.B. 16, A.L. 2005 S.B. 280