Mo. Rev. Stat. § 115.425
Name must be on precinct register to be eligible to vote, exception.
115.425. Name must be on precinct register to be eligible to vote, exception. — Except as provided in subsection 4 * of section 115.277 , the election judges shall allow no person to vote whose name does not appear in the precinct register without the express sanction of the election authority.
(L. 1977 H.B. 101 § 11.040) Effective 1-01-78 *Statutory reference to subsection "2" changed to "4" in accordance with section 3.060 based on renumbering in section 115.277 by H.B. 1878, 2022.