30 ILCS 5/3-4
The Auditor General shall make such investigations as are directed by either house of the General Assembly or by the Commission in a resolution specifying the acts, transactions or practices to be the subject of the investigation.
The resolution directing such an investigation may specify to whom the Auditor General shall make his findings and recommendations after the investigation and whether those findings and recommendations are to be made public.
Unless the resolution directing the investigation provides otherwise, the Auditor General shall direct and provide his findings and recommendations to the Commission, to the Governor, to the official in charge of each agency included in the investigation and to each person who was named individually as a subject of investigation by the directing resolution. No other publicity shall be given to the report and recommendations other than is provided by this paragraph.
The Auditor General may recommend to the Commission that an investigation be directed with regard to any matter which he believes to be in the public interest to investigate.
30 ILCS 5/3-4