(1) No person may be excused from testifying or from producing books, accounts and papers in any proceeding based upon or growing out of any violation of this chapter on the ground or for the reason that the testimony or evidence may tend to incriminate or subject the person to penalty or forfeiture, but no person having so testified may be prosecuted or subjected to any penalty or forfeiture for or on account of any such testimony. No person so testifying may be exempted from prosecution or punishment for perjury in testifying.
(2) The immunity provided under sub.
(1) is subject to the restrictions under s. 972.085.