R.I. Gen. Laws § 28-37-3: Investment of surplus funds.

The general treasurer as custodian of this fund is authorized to invest any moneys not immediately necessary for the execution of the purposes of this fund in the class of securities legal for the investment of public moneys of this state; provided, that the investment shall at all times be so made that all the assets of the fund shall always be readily convertible into cash when needed for disbursements as provided in this chapter.