Mo. Rev. Stat. § 210.580 (2026)

  210.580.  Compact binding, when. — The compact shall become binding upon the state of Missouri upon legislative enactment of the compact into law by no less than thirty-five of the states.  The initial effective date shall be the later of August 28, 2007, or upon enactment into law by the thirty-fifth jurisdiction^*.  Thereafter it shall become effective and binding as to any other compacting state upon enactment of the compact into law by that state.