S.D. Codified Laws § 12-19-2.5

The State Board of Elections shall promulgate rules, pursuant to chapter 1-26, to prescribe the absentee application form and a combined absentee ballot application form and return envelope for absentee voting in the office of the person in charge of the election. The application may be made by letter or upon any form containing the required information or upon any form prescribed by the State Board of Elections or the postcard form referred to in § 12-4-8.1, executed by any person authorized in accordance with the Uniformed and Overseas Citizens Absentee Voting Act, 52 U.S.C. § 20301 et seq., as of January 1, 2023.