(a) Subject to the law governing the district, the board shall adopt the following in writing:
(1) a code of ethics for district directors, officers, employees, and persons who are engaged in handling investments for the district;
(2) a policy relating to travel expenditures;
(3) a policy relating to district investments that ensures that:
(A) purchases and sales of investments are initiated by authorized individuals, conform to investment objectives and regulations, and are properly documented and approved; and
(B) periodic review is made of district investments to evaluate investment performance and security;
(4) policies and procedures for selection, monitoring, or review and evaluation of professional services; and
(5) policies that ensure a better use of management information, including:
(A) budgets for use in planning and controlling cost; and
(B) an audit or finance committee of the board.
(b) The state auditor may audit the records of any district if the state auditor determines that the audit is necessary.