Okla. Stat. tit. 22, § 22-715: Witness residing outside county – Subpoena of court

clerks.

A. No person is obliged to attend as a witness before a court

or magistrate outside the county where the witness resides or is

served with a subpoena, unless the judge of the court in which the

offense is triable, upon an affidavit of the district attorney, or

of the defendant or the defendant’s counsel, stating that he or she

believes that the evidence and attendance of the witness is material

and necessary, shall endorse on the subpoena an order for the

attendance of the witness.

B. The court clerks of this state shall not be subject to

subpoena unless the court makes a specific finding that appearance

and testimony are both material and necessary because of a written

objection to the introduction of certified documents made by the

defendant or other party prior to trial.