Okla. Stat. tit. 15, § 15-598.9: Witnesses - Production of books, records, etc

Any defendant, or any witness, in any civil action brought under

the provisions of this act may be required to testify, and any

defendant, or any witness, may, upon proper process, be compelled to

produce his books, records, invoices and all other documents of any

such defendant or witness into court and the same may be introduced

as evidence, but no defendant, or any witness in such civil action

shall be prosecuted or subjected to any penalty or forfeiture for or

on account of any transaction, matter or thing concerning which he

may thus be required to testify or produce evidence, documentary or

otherwise, and no testimony thus given or produced shall be received

against him upon any criminal proceeding or investigation.