RSMO 571.107 (excerpt) No concealed carry permit issued pursuant to sections 571.101 to 571.121, shall authorize any person to carry concealed firearms into:
(10) Any higher education institution or elementary or secondary school facility without the consent of the governing body....
2. Carrying of a concealed firearm in a location specified in subdivisions (1) to (17) of this section by any individual who holds a concealed carry permit shall not be a criminal act. If such person refuses to leave the premises and a peace officer is summoned, such person may be issued a citation for an amount not to exceed one hundred dollars for the first offense.
King Richard III (I, iii, 336-338)
Marbury v. Madison 1803, vol 5, pg 137
It is also not entirely unworthy of observation that, in declaring what shall be the supreme law of the land, the Constitution itself is first mentioned, and not the laws of the United States generally, but those only which shall be made in pursuance of the Constitution, have that rank.
Thus, the particular phraseology of the Constitution of the United States confirms and strengthens the principle, supposed to be essential to all written Constitutions, that
a law repugnant to the Constitution is void,
and that courts, as well as other departments, are bound by that instrument.
emphasis added.