Once delivered, a pardon cannot be revoked unless it was obtained through fraud. If a pardon is obtained through fraud, it is void.
S.C. Code Ann. § 24-21-980
Pardon obtained through fraud
1981 Act No. 100, SECTION 14.
Official source: South Carolina Legislature. Reproduced from public-domain South Carolina statutes; confirm against the official source for the current text. Not legal advice.