Payrolls or other vouchers claiming compensation for services rendered by employee on Sunday or holidays must bear the following certificate signed by the head of the department or other duly authorized official thereof:
I hereby certify that the services performed on Sundays and holidays, as charged herein, were necessary and for the best interests of the State.
N.Y. Comp. Codes R. & Regs. Tit. 2 § 3.9