There is created a special fund, to be known as the vocational rehabilitation fund. The fund shall consist of all monies appropriated by this State and all monies received from the United States or any other source for such purpose, as provided by this chapter. All monies in this fund shall be deposited, administered, and disbursed in the same manner and under the same conditions and requirements as provided by law for other public funds in the State Treasury. All monies in this fund are appropriated and made available to the agency, and shall be expended solely for the purposes of this chapter. Any balances in the fund shall not lapse at any time but shall be continuously available to the agency for expenditure consistent with this chapter. The agency, acting through the commissioner, shall issue its requisition for payment of all costs of administering this chapter to the Comptroller General, who shall draw his warrant in the usual form provided by law on the State Treasurer, who shall pay it by check on the vocational rehabilitation fund.