Witnesses’ privileges.

No person shall be excused from attending and testifying, or producing any books, papers, or other documents before any court, referee, or grand jury upon any investigation, proceeding, or trial, for or relating to or concerned with a violation of any section of this law or attempt to commit such violation, upon the ground or for the reason that the testimony or evidence, documentary or otherwise, required by the state may tend to convict the person of a crime or to subject him or her to a penalty or forfeiture; but no person shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter, or thing concerning which the person may so testify or produce evidence, documentary or otherwise, and no testimony so given or produced shall be received against the person, upon any criminal investigation, proceeding, or trial, except upon a prosecution for perjury or contempt of court, based upon the giving or producing of such testimony.