In criminal cases the prosecution is entitled to one and the defendant to two peremptory challenges for each alternate juror called under the provisions of Section 14-7-320 and in civil cases, each party shall have one strike for each alternate juror.
Challenges and strikes of alternate jurors
S.C. Code Ann. § 14-7-1120, under Title 14, Chapter 7.
S.C. Code Ann. § 14-7-1120