70 ILCS 1815/27
The State and all counties, cities, villages, incorporated towns and other municipal corporations, political subdivisions and public bodies, and public officers of any thereof, all banks, bankers, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies and other persons carrying on an insurance business, and all executors, administrators, guardians, trustees and other fiduciaries, may invest lawfully any sinking funds, moneys or other funds belonging to them or within their control in any bonds or certificates issued pursuant to this Act. The purpose of this Section is to authorize investment in such bonds or certificates, by all sinking, insurance, retirement, compensation, pension and trust funds, whether owned or controlled by private persons or public officers. Nothing contained in this Section relieves any person or officer from any duty to exercise reasonable care in selecting securities for purchase or investment.
70 ILCS 1815/27