(1)    Creation. A “public employee trust fund” is created to aid public employees in protecting themselves and their beneficiaries against the financial hardships of old age, disability, death, illness and accident, thereby promoting economy and efficiency in public service by facilitating the attraction and retention of competent employees, by enhancing employee morale, by providing for the orderly and humane departure from service of employees no longer able to perform their duties effectively, by establishing equitable benefit standards throughout public employment, by achieving administrative expense savings and by facilitating transfer of personnel between public employers.

   (2)   Purpose. The public employee trust fund is a public trust and shall be managed, administered, invested and otherwise dealt with solely for the purpose of ensuring the fulfillment at the lowest possible cost of the benefit commitments to participants, as set forth in this chapter, and shall not be used for any other purpose. Revenues collected for and balances in the accounts of a specific benefit plan shall be used only for the purposes of that benefit plan, including amounts allocated under s. 40.04 (2), and shall not be used for the purposes of any other benefit plan. Each member of the employee trust funds board shall be a trustee of the fund and the fund shall be administered by the department of employee trust funds. All statutes relating to the fund shall be construed liberally in furtherance of the purposes set forth in this section.

   (3)   Compatibility of trustee responsibilities. Membership on the employee trust funds board, group insurance board, deferred compensation board, Wisconsin retirement board and the teachers retirement board shall not be incompatible with any other public office. The board members and the employees of the department shall not be deemed to have a conflict of interest in carrying out their responsibilities and duties in administering this chapter, or taking other appropriate actions necessary to achieve the purposes of this chapter, solely by reason of their being eligible for benefits under the benefit plans provided under this chapter. However, any board member or employee of the department is expressly prohibited from participating in decisions directly related to a specific benefit, credit, claim or application of the person and from participating in negotiations or decisions on the selection of actuarial, medical, legal, insurance or other independent contractors if the board member or employee of the department has a direct or indirect financial interest in or is an officer or employee or is otherwise associated with the independent contractor.