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.