S.D. Codified Laws § 12-18-16 (2026)
If a paper ballot is used, the voter may use a pencil or pen to mark the voter's ballot and the voter may mark the ballot with either a cross (x) or check mark (√).
Source: SDC 1939, §§ 16,1105 (4), 16.1302; SL 1957, ch 84 , §§ 2, 3; SDC Supp 1960, § 16.0224-1; SDCL, §§ 12-13-19, 12-18-19; SL 1974, ch 118 , § 121; SL 2002, ch 76 , § 1.