S.D. Codified Laws § 12-18-7.2
If any person attempting to vote in any election claims to be registered or any person attempting to vote in any election claims to be in the inactive registration file but does not possess an acknowledgment notice and the person's name does not appear in the registration list of the precinct, the person may vote if one of the members of the precinct election board first confirms by telephone or other means with the county auditor or a deputy auditor that the name was erroneously omitted from the list, and an emergency voting card, in duplicate, in the form prescribed by the State Board of Elections is signed by the applicant and each member of the precinct election board. The original emergency voting card shall be retained by the precinct superintendent as part of the precinct superintendent's permanent records, and the duplicate shall be given to the voter. In a primary election, the party affiliation of any voter using the emergency voting procedure of this section shall be designated on the emergency voting card.
SDCL 12-18-7.2