1. In the discharge of the duties imposed by this law, the director, the commission, an appeals tribunal, and any duly authorized representative of any of them shall have power to administer oaths and affirmations, take depositions, certify to official acts, and issue subpoenas to compel the attendance of witnesses and the production of books, papers, correspondence, memoranda, and other records deemed necessary as evidence in connection with a disputed determination or any other phase of the administration of this law. Witnesses subpoenaed pursuant to this subsection shall be allowed mileage and per diem at a rate fixed by the division. Such fees shall be deemed a part of the expense of administering this law.

2. No person shall be excused from attending and testifying or from producing books, papers, correspondence, memoranda and other records before the director, the commission, an appeals tribunal, or any duly authorized representative of any of them on the ground that the testimony or evidence, documentary or otherwise, required of him may tend to incriminate him or subject him to a penalty or forfeiture; but no individual shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter, or thing concerning which he is compelled, after having claimed his privilege against self-incrimination, to testify or produce evidence, documentary or otherwise, except that such individual so testifying shall not be exempt from prosecution and punishment for perjury committed in so testifying.