Mo. Rev. Stat. § 578.503
The enactment of section 578.502 shall become effective only on the date the provisions of section 578.501 are finally declared void or unconstitutional by a court of competent jurisdiction and upon notification by the attorney general to the revisor of statutes.
(L. 2006 H.B. 1026 § C)
*Revisor's note: Notification of the unconstitutionality of section 578.501 as determined by court decision was provided by the attorney general to the revisor of statutes on July 15, 2013.