S.C. Code Ann. § 7-13-790

If a voter shall mar or deface his ballot, he may obtain one additional ballot upon returning to the managers in charge of the ballots the ballot so marred or defaced with the stub attached. The manager in charge of the poll list shall change the number of the ballot on the poll list and place the marred or defaced ballot in a file. No voter shall be given a second ballot until he has returned the first one with the stub attached.