N.J. Stat. Ann. § 48:2-30

When any contract is made by the board for professional or expert services for the purposes of carrying out any of the provisions of this chapter, the board shall make requisition on the state comptroller for the reservation of such sum as may be required to make payments for the services and doing the work agreed upon in the contract. The comptroller shall reserve for the purpose of making such payments, from the money appropriated by the legislature for the salaries and expenses of the board, the sum called for in the requisition.