Okla. Stat. tit. 19, § 215.40

There is hereby created in the State Treasury a revolving fund for the Office of the Attorney General to be designated the "District Attorneys Evidence Fund". The fund shall be a continuing fund, not subject to fiscal year limitations, and shall consist of any monies transferred thereto by an act of the Legislature. All monies accruing to the credit of said fund are hereby appropriated and may be budgeted and expended by the District Attorneys Council for necessary expenses relative to any pending case within the official responsibility of the offices of the district attorneys. Expenditures from said fund shall be made upon warrants issued by the State Treasurer against claims filed as prescribed by law with the Director of the Office of Management and Enterprise Services for approval and payment.