SDCL § 12-18-24: Replacement of spoiled ballots--Marking and preservation.

If any voter spoils a ballot, the voter may obtain another ballot, and so on, successively, not to exceed three ballots in all, upon returning to a member of the precinct election board the spoiled ballot. In obtaining a ballot to replace a spoiled one, the name of the voter shall be given and the number of the spoiled ballot. The number shall be noted opposite of the voter's name as spoiled. The ballots that are returned shall be canceled by writing the words, spoiled and replaced, across the face of the ballot and each spoiled ballot shall be placed in a separate envelope identifying the spoiled ballots as such and stating the number of spoiled ballots for accounting purposes.