If any person objects to testifying or producing evidence, documentary or otherwise, at any proceeding before an administrative agency, claiming a privilege against self-incrimination, but is directed to testify or produce evidence pursuant to the written approval of the attorney general, that person must comply with the direction but no testimony or evidence compelled from that person, after a valid claim of privilege against self-incrimination has been made, may be used against that person in any criminal proceeding subjecting that person to a penalty or forfeiture. No person testifying at any proceeding before an administrative agency may be exempted from prosecution and punishment for perjury or giving a false statement, or for contempt committed in answering, or failing to answer, or in producing, or in failing to produce, evidence pursuant to direction given under this section.