Mo. Rev. Stat. § 336.070
Every holder of a certificate of registration shall display it in a conspicuous place in his principal office, place of business or employment. Whenever a registered optometrist practices optometry outside of, or away from, his principal office, places of business or employment, he shall deliver to each patient in his care a certificate of identification or provide other identification as authorized by rule and regulation.
(RSMo 1939 § 10119, A.L. 1981 S.B. 16)
Prior revision: 1929 § 13507