Okla. Stat. tit. 12 § 412
In the case of proceedings before a committee that two-thirds (2/3) of the members of the full committee shall by affirmative vote have authorized such witness, to be granted immunity under this act with respect to the transactions, matters or things concerning which he is compelled, after having claimed his privilege against self-incrimination, to testify or produce evidence by direction of the presiding officer and that an order of the district or superior court for the county wherein the inquiry is being carried on has been entered into the record requiring said person to testify or produce evidence. Such an order may be issued by a district or superior court judge upon application by a duly authorized representative of the House of Representatives or Senate or of the committee concerned. Neither house nor any committee thereof nor any joint committee of the two houses of the Legislature shall grant immunity to any witness without first having notified the Attorney General of the State of Oklahoma of such action and thereafter having secured the approval of the district or superior court for the county wherein the inquiry is being held. The Attorney General of the State of Oklahoma shall be notified of the time of each proposed application to the district or superior court and shall be given an opportunity to be heard with respect thereto prior to the entrance into the record of the order of the district or superior court. No witness shall be exempt from prosecution for perjury or contempt committed while giving testimony or producing evidence under compulsion as provided in this section.
Okla. Stat. tit. 12, § 412