MO Rev Stat § 115.105 (2021)
2021 Missouri Revised Statutes|Title IX - Suffrage and Elections|Chapter 115 - Election Authorities and Conduct of Elections|Section 115.105 - Challengers, how selected, qualifications — challenges, when made — challengers may collect certain information at presidential primary elections — challenges, how made.

Effective - 28 Aug 2016, 2 histories   115.105. Challengers, how selected, qualifications — challenges, when made — challengers may collect certain information at presidential primary elections — challenges, how made. — 1. The chair of the county committee of each political party named on the ballot shall have the right to designate a challenger for each polling place, who may be present until all ballots are cast on the day of election, and a challenger for each location at which absentee ballots are counted, who may be present while the ballots are being prepared for counting and counted. No later than four business days before the election, the chair of each county committee of each political party named on the ballot shall provide signed official designation forms with the names of the designated challengers and substitutes to the local election authority for confirmation of eligibility to serve as a challenger. The local election authority, after verifying the eligibility of each designated and substitute challenger, shall sign off on the official designation forms, unless the challenger is found not to have the qualifications established by subsection 5 of this section. If the election authority determines that a challenger does not meet the qualifications of subsection 5 of this section, the designating party chair may designate a replacement challenger and provide the local election authority with the name of the replacement challenger before 5:00 p.m. of the Monday preceding the election. The designating chair may substitute challengers at his or her discretion during such hours.  2. Challenges may only be made when the challenger believes the election laws of this state have been or will be violated, and each challenger shall report any such belief to the election judges, or to the election authority if not satisfied with the decision of the election judges.  3. Prior to the close of the polls, challengers may list and give out the names of those who have voted. The listing and giving out of names of those who have voted by a challenger shall not be considered giving information tending to show the state of the count.  4. In a presidential primary election, challengers may collect information about the party ballot selected by the voter and may disclose party affiliation information after the polls close.  5. All persons selected as challengers shall have the same qualifications required by section 115.085 for election judges, except that such challenger shall be a registered voter in the jurisdiction of the election authority for which the challenger is designated as a challenger.  6. Any challenge by a challenger to a voter's identification for validity shall be made only to the election judges or other election authority. If the poll challenger is not satisfied with the decision of the election judges, then he or she may report his or her belief that the election laws of this state have been or will be violated to the election authority as allowed under this section. ­­-------- (L. 1977 H.B. 101 § 4.001, A.L. 1983 S.B. 234, A.L. 1999 H.B. 676, A.L. 2003 H.B. 511, A.L. 2006 S.B. 1014 & 730, A.L. 2016 S.B. 786)