Mo. Rev. Stat. § 324.427
It is unlawful for any person to advertise or indicate to the public that the person is a registered commercial interior designer in this state, unless such person is registered as a registered commercial interior designer by the council and is in good standing pursuant to sections 324.400 to 324.439.
(L. 1998 H.B. 1601, et al. § 10, A.L. 1999 H.B. 343)