SDCL § 12-18-27: Marked ballot not to be publicized--Immediate deposit in ballot box.

No person may publicize an official ballot after it is marked to any person in such a way as to reveal the contents of the official ballot, or the name of any candidate for whom the person has marked a vote. No person may solicit a voter to show the voter's official ballot. Immediately after marking the official ballot the voter shall deposit the official ballot in the ballot box, if necessary, leaving the official stamp exposed.