N.J. Stat. § 18A:58-33.38
Pending application to the purposes for which bonds or notes entitled to the benefits of this act are issued, the proceeds of such bonds or notes shall be invested or deposited subject to regulations prescribed by the State Treasurer. On January 10 in each year the custodian of school moneys of a Type II school district, the chief financial officer of the municipality of a Type I school district or chief financial officer of the county, as the case may be, shall certify and pay to the State Treasurer the amount of earnings received during the preceding year from the investment or deposit of the proceeds from the sale of such bonds or notes, which amounts shall be held by him and applied only to the payment of principal and interest on such bonds or notes.
N.J.S. § 18A:58-33.38