(a) If any individual asks to be excused from attending or testifying or from producing any books, papers, records, contracts, correspondence or other documents in connection with any examination, hearing or investigation being conducted by the Commissioner, or the Commissioner's examiner, on the ground that the testimony or evidence required of the individual may tend to incriminate the individual, or subject the individual to a penalty or forfeiture and shall, by the Attorney General, be directed to give such testimony or produce such evidence, the individual must nonetheless comply with such direction, but the individual shall not thereafter be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter or thing concerning which the individual may have so testified or produced evidence, and no testimony so given or evidence produced shall be received against the individual upon any criminal action, investigation or proceeding; except, however, that no such individual so testifying shall be exempt from prosecution or punishment for any perjury committed by the individual in such testimony, and the testimony or evidence so given or produced shall be admissible against the individual upon any criminal action, investigation or proceeding concerning such perjury, nor shall such individual be exempt from the refusal, suspension or revocation of any license, permission or authority conferred or to be conferred, pursuant to this title.
(b) Any such individual may execute, acknowledge and file in the office of the Commissioner and of the Attorney General 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 individual 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 shall not be entitled to any immunity or privileges on account of any testimony given or evidence so produced.