S.C. Code Ann. § 14-7-1760

If any person asks to be excused from testifying before a state grand jury or from producing any books, papers, records, correspondence, or other documents before a state grand jury on the ground that the testimony or evidence required of him may tend to incriminate him or subject him to any penalty or forfeiture and is notwithstanding directed by the presiding judge to give the testimony or produce the evidence, he must comply with this direction, but no testimony so given or other information produced, or any information directly or indirectly derived from such testimony or such other information, may be received against him in any criminal action, criminal investigation, or criminal proceeding. No individual testifying or producing evidence or documents is exempt from prosecution or punishment for any perjury committed by him while so testifying, and the testimony or evidence given or produced is admissible against him upon any criminal action, criminal investigation, or criminal proceeding concerning this perjury; provided that any individual may execute, acknowledge, and file a statement with the appropriate court expressly waiving immunity or privilege in respect to any testimony or evidence given or produced and thereupon the testimony or evidence given or produced may be received or produced before any judge or justice, court, tribunal, grand jury, or otherwise, and if so received or produced, the individual is not entitled to any immunity or privilege on account of any testimony he may give or evidence produced.