Missouri constitution
Article III: legislative department
Section 25

No bill other than an appropriation
bill shall be introduced in either house after the sixtieth legislative day unless consented
to by a majority of the elected members of each house or the governor shall request
a consideration of the proposed legislation by a special message. No appropriation bill
shall be taken up for consideration after 6:00 p.m. on the first Friday following the first
Monday in May of each year.