The expenditure of money appropriated by the General Assembly is by warrant requisitions directed to the Comptroller General. Upon receipt of the requisition, accompanied by invoices or other satisfactory evidence of the propriety of the payment, and itemized according to standard budget classifications, the Comptroller General shall issue a warrant on the State Treasurer to the payee designated in the requisition. Requisitions for warrants may not be processed for amounts less than one dollar. Upon approval and designation by the Department of Administration, state institutions may requisition funds in favor of their own treasurer, itemized only to the extent of the purpose of the appropriation as expressed in the act or joint resolution appropriating the funds, and may deposit these funds in the name of the institution in the bank or banking institutions designated by the State Treasurer, and disburse these funds by check in order to meet the purposes of the appropriation. Strict account must be kept of all these expenditures according to standard budget classifications. Money may be drawn only when actually owing and due. The Comptroller General shall establish rules and regulations for the uniform reimbursement, remittance, and transfers of funds to the general fund of the State as required by law.