SDCL § 12-19-7: Marking and folding ballot--Officer before whom marked--Mailing or delivering ballot.

A voter voting an absentee ballot shall mark it and fold it without revealing the marks to any other person. The voter shall place the voted ballots in the return envelope provided and seal the envelope. The voter shall sign the statement on the return envelope. The voter shall return the ballot to the office of the person in charge of the election by:

(1) Mailing the ballot;

(2) Delivering the ballot in person; or

(3) Providing the ballot to an absentee ballot messenger to deliver the ballot in person as prescribed by this chapter.