30 ILCS 5/3-2
The Auditor General shall conduct a financial audit, a compliance audit, or other attestation engagement, as is appropriate to the agency's operations under generally accepted government auditing standards, of each State agency except the Auditor General or his office at least once during every biennium, except as is otherwise provided in regulations adopted under Section 3-8. The general direction and supervision of the financial audit program may be delegated only to an individual who is a Certified Public Accountant and a payroll employee of the Office of the Auditor General. In the conduct of financial audits, compliance audits, and other attestation engagements, the Auditor General may inquire into and report upon matters properly within the scope of a performance audit, provided that such inquiry shall be limited to matters arising during the ordinary course of the financial audit.
In any year the Auditor General shall conduct any special audits as may be necessary to form an opinion on the financial statements of this State, as prepared by the Comptroller, and to certify that this presentation is in accordance with generally accepted accounting principles for government.
Simultaneously with the biennial compliance audit of the Department of Human Services, the Auditor General shall conduct a program audit of each facility under the jurisdiction of that Department that is described in Section 4 of the Mental Health and Developmental Disabilities Administrative Act. The program audit shall include an examination of the records of each facility concerning (i) reports of suspected abuse or neglect of any patient or resident of the facility and (ii) reports of violent acts against facility staff by patients or residents. The Auditor General shall report the findings of the program audit to the Governor and the General Assembly, including findings concerning patterns or trends relating to (i) abuse or neglect of facility patients and residents or (ii) violent acts against facility staff by patients or residents. However, for any year for which the Inspector General submits a report to the Governor and General Assembly as required under Section 6.7 of the Abused and Neglected Long Term Care Facility Residents Reporting Act, the Auditor General need not conduct the program audit otherwise required under this paragraph.
The Auditor General shall conduct a performance audit of a State agency when so directed by the Commission, or by either house of the General Assembly, in a resolution identifying the subject, parties and scope. Such a directing resolution may:
The Commission may by resolution clarify, further direct, or limit the scope of any audit directed by a resolution of the House or Senate, provided that any such action by the Commission must be consistent with the terms of the directing resolution.
30 ILCS 5/3-2