S.D. Codified Laws § 12-4-19.2 (2026)
If the card is not returned to the county auditor within the stated time limit or is undeliverable, the county auditor shall move the voter to an inactive registration file.
Source: SL 1975, ch 120 , § 3; SL 1976, ch 105 , § 10; SL 1992, ch 107 , § 4; SL 1994, ch 107 , § 22; SL 2002, ch 40 , § 11.