No person shall be excused from testifying before said Attorney General, magistrate, or notary public, at any such investigation, or be excused from testifying in any proceeding brought in any court of competent jurisdiction under the provisions of this act, on the ground that his testimony may tend to incriminate him; 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 he may testify or produce evidence; nor shall such testimony be used against him for any crime or misdemeanor under the laws of this state, or in any subsequent civil proceeding against said witness. Added by Laws 1917, c. 205, p. 382, § 11, emerg. eff. Feb. 19, 1917.
Oklahoma Legal Code