W. Va. Code § 33-2-7

If any person shall ask to be excused from attending and testifying or from producing any books, papers, records, correspondence or other documents at any hearing conducted pursuant to this chapter or chapter twenty-three of this code or in any cause or proceeding instituted by the commissioner pursuant to this chapter or chapter twenty-three of this code on the ground that the testimony or evidence required of him may tend to incriminate him or subject him to a criminal penalty and shall notwithstanding be directed by the commissioner to give such testimony or produce such evidence, he must nonetheless comply with such direction, but he shall not thereafter be prosecuted or subjected to any criminal penalty for or on account of any matter or thing concerning which he may testify or produce evidence, pursuant thereto, and no testimony so given or evidence produced shall be received against him upon any criminal action, investigation or proceeding: Provided, That no such individual so testifying shall be exempt from prosecution or punishment for any perjury or false swearing, committed by him while so testifying and the testimony or evidence so given or produced is admissible against him upon any criminal action, investigation or proceeding concerning such perjury or false swearing, nor is he exempt from the refusal, revocation or suspension of any license, permission or authority conferred, or to be conferred, pursuant to this chapter. Any such individual may execute, acknowledge and file in the office of the commissioner a statement expressly waiving such immunity or privilege in respect to any transaction, matter or thing specified in such statement and thereupon the testimony of such person or such evidence in relation to such transaction, matter or thing may be received or produced before any judge or justice, court, tribunal, grand jury or otherwise, and if so received or produced such individual is not entitled to any immunity or privilege on account of any testimony he may so give or evidence so produced.