The Auditor General may initiate and conduct a special audit whenever he determines it to be in the public interest.
The Auditor General may initiate and conduct an economy and efficiency audit of a State agency or program whenever the findings of a post audit indicate that such an audit is advisable or in the public interest, if he has given the Commission at least 30 days' prior notice of his intention to conduct the audit and the Commission has not disapproved of that audit.
The Auditor General may, at any time, make informal inquiries of any agency concerning its obligation, receipt, expenditure or use of State funds, but such an inquiry may not be in the nature of an investigation or post audit.
30 ILCS 5/3-3