Okla. Stat. tit. 51, § 51-101: Witnesses

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.