S.C. Code Ann. § 7-13-800: Write-ins to be in handwriting of voter or authorized manager.

In casting a write-in ballot, the voter shall cast it in his own handwriting or in the handwriting of a duly authorized manager who is aiding the voter in casting his ballot when assistance is authorized by this Title.

Nothing contained in this section shall be construed to prevent the use of electronic methods of casting write-in ballots or the use of voting machines which do not employ paper and handwriting methods or technology for casting write-in ballots.