30 ILCS 210/3

It is hereby declared to be the public policy of this State to aggressively pursue the collection of accounts or claims due and payable to the State of Illinois through all reasonable means. To this end, this Act is supplementary to existing State laws prescribing the means of collection of amounts owing to the State of Illinois and nothing in this Act shall be construed to require compliance with the procedures set forth herein as a condition precedent to compliance with any other statute regulating or prescribing State collection procedures. Except as provided in Section 8, each State agency shall have the principal responsibility for the timely collection of accounts or claims owed to the State agency.