S.D. Codified Laws § 12-11-2.1
If the date of the special election conducted pursuant to § 12-11-1.1 requires that absentee ballots cast by absent uniformed services voters or overseas voters arriving after election day be counted as required by 2 USC Chapter 1 § 8 as of January 1, 2008, these absentee ballots shall be processed and counted by the provisional ballot counting board. The provisional ballot counting board shall meet on the deadline established in 2 USC Chapter 1 § 8 as of January 1, 2008, for the return of these absentee ballots. The official county canvass shall be conducted within twenty-four hours after the conclusion of the absentee and provisional ballot count. The official state canvass shall be held within three days after the conclusion of the county canvass.
SDCL 12-11-2.1