72 Pa. Stat. § 4545
On and after the first day of June, one thousand nine hundred and nine, every warrant drawn by the Auditor General upon the State Treasurer shall be transmitted by the Auditor General to the State Treasurer, who shall, thereupon, make payment to the person, persons, firm, or corporation named as payee or payees in the warrant; and said warrant shall be retained by the State Treasurer, to be filed by him as a voucher in the office of the Auditor General. And every warrant drawn by any other officer of the Commonwealth, who now is, or may hereafter be, by law, authorized to draw warrants upon the State Treasurer, shall first be transmitted to the Auditor General, for his counter signature; and shall thereafter be paid by the State Treasurer, in the same manner as hereinbefore prescribed in the case of warrants drawn by the Auditor General.
72 P.S. § 4545