Section 40 ILCS 5/15-167.1 - Participation in commingled investment funds-Transfer of investment functions and securities(a) The retirement board may invest in any commingled investment fund or funds established and maintained by the Illinois State Board of Investment under Article 22A of this Code. All commingled fund participations shall be subject to the law governing the Illinois State Board of Investment and the rules, policies and directives of that Board.(b) The retirement board may, by resolution duly adopted by a majority vote of its membership, transfer to the Illinois State Board of Investment created by Article 22A of this Code, for management and administration, all investments owned by the system of every kind and character. Upon completion of such transfer, the authority of the retirement board to make investments shall terminate. Thereafter, all investments of the reserves of the system shall be made by the Illinois State Board of Investment in accordance with Article 22A of this Code. The transfer shall be made not later than the first day of the fourth month next following the date of such resolution. Before such transfer, an audit of the investments shall be completed by a certified public accountant selected by the Illinois State Board of Investment and approved by the Auditor General of the State of Illinois. The expense of the audit shall be assumed by the retirement board.