Minn. Stat. § 216B.31: TESTIMONY AND PRODUCTION OF RECORDS; PERJURY.

No person shall be excused from testifying or from producing any book, document, paper, or account in any investigation, or inquiry by, or hearing before, the commission or any commissioner, or person designated by it to conduct hearings, when ordered to do so, upon the ground that the testimony or evidence, book, document, paper, or account required may tend to incriminate the person or subject the person to penalty or forfeiture; but no person shall be prosecuted, punished, or subjected to any forfeiture or penalty for or on account of any act, transaction, matter, or thing concerning which the person shall have been compelled under oath to testify or produce documentary evidence; provided, that no person so testifying shall be exempt from prosecution or punishment for any perjury committed in testimony.