S.C. Code Ann. § 7-13-160: Peace officers shall enter polling place only on request or to vote.

No sheriff, deputy sheriff, policeman or other officers shall be allowed to come within the polling place except to vote unless summoned into it by a majority of the managers. On failure of any sheriff, deputy sheriff, policeman or other officer to comply with the provisions of the preceding sentence, the managers of election, or one of them, shall make affidavit against such sheriff, deputy sheriff, policeman or other officer for his arrest.