Sec. 4. APPLICATION AND APPROVAL BY JUDGE. A reimbursement to a witness as provided by this article shall be paid by the state to the witness or his assignee. Claim shall be made by sworn application to the comptroller, a copy of which shall be filed with the clerk of the court, setting out the facts showing entitlement as provided in this article to the reimbursement, which application shall be presented for approval by the judge who presided over the court or empaneled the grand jury before whom the criminal proceeding was pending. No fee shall be required of any witness for the processing of his claim for reimbursement.