Since 1875, in the Missouri Constitution:
BILL OF RIGHTS
Public aid for religious purposes–preferences and discriminations on religious grounds.
Section 7. That no money shall ever be taken from the public treasury, directly or indirectly, in aid of any church, sect or denomination of religion, or in aid of any priest, preacher, minister or teacher thereof, as such; and that no preference shall be given to nor any discrimination made against any church, sect or creed of religion, or any form of religious faith or worship.
Also in the Missouri Constitution, since 1875:
Prohibition of public aid for religious purposes and institutions.
Section 8. Neither the general assembly, nor any county, city, town, township, school district or other municipal corporation, shall ever make an appropriation or pay from any public fund whatever, anything in aid of any religious creed, church or sectarian purpose, or to help to support or sustain any private or public school, academy, seminary, college, university, or other institution of learning controlled by any religious creed, church or sectarian denomination whatever; nor shall any grant or donation of personal property or real estate ever be made by the state, or any county, city, town, or other municipal corporation, for any religious creed, church, or sectarian purpose whatever.
In, not one, but two places in the Missouri Constitution. They obviously felt very strongly about those establishment clauses in 1875.
You just know right wingnuts want to get their hands on public education monies.
A constitutional amendment prefiled for the 2018 session in the Missouri House:
Proposes a constitutional amendment eliminating the prohibition on the use of public funds for the benefit of any religious or sectarian educational purpose
Sponsor: Shumake, Lindell (005)
Proposed Effective Date: 8/28/2018
LR Number: 4361H.01I
Last Action: 12/01/2017 – Prefiled (H)
Bill String: HJR 55
They want to defund public education, they want vouchers for religious schools, and they want you to pay for it.
Get your colanders ready.