Mo. Rev. Stat. § 324.430
No person may use the designation registered commercial interior designer in Missouri, unless the council has issued a current certificate of registration certifying that the person has been duly registered as a registered commercial interior designer in Missouri and unless such registration has been renewed or reinstated as provided in section 324.418.
(L. 1998 H.B. 1601, et al. § 11, A.L. 1999 H.B. 343)