Mo. Rev. Stat. § 208.171
208.171 Effective date of certain sections.
208.171. Effective date of certain sections. — Sections 1, 207.010 , 207.060 , 208.010 , 208.015 , 208.030 , 208.042 , 208.060 , 208.120 , 208.150 , 208.160 , 208.170 , and 209.040 of this act shall become effective January 1, 1974, or upon the operational date of Title XVI of Public Law 92-603, establishing the federal program of supplemental security income for the aged, blind and disabled, whichever occurs later.
(L. 1973 S.B. 325 § A) Effective 1-1-74