SDCL § 12-18-39: Provisional ballot--Eligibility.

If any person is not authorized to vote pursuant to § 12-18-7.2, is successfully challenged under § 12-18-10, or is otherwise denied the ability to vote and the person maintains that he or she is currently registered to vote in that precinct, the person may cast a ballot which shall be called a provisional ballot. A member of the precinct election board shall notify any person who is denied the ability to vote that the person may cast a provisional ballot.