Okla. Stat. tit. 52, § 119

In all cases involving the offering, promising, giving or receiving any gift, or gratuity, made criminal by Sections 34 and 35 of this act, and in all cases for conspiracy under Section 32 of this act, the party to such crime or crimes who shall first furnish information in relation thereto as against the other party or parties thereto, and in any prosecution therefor shall testify to the same truthfully and fully, shall not thereafter be criminally liable therefor, but in such cases no conviction shall be had on the uncorroborated testimony of one such witness. Added by 1933, c. 131, p. 297, § 36, emerg. eff. April 10, 1933.