30 ILCS 5/3-6
The Auditor General may adopt regulations establishing post audit standards consistent with Sections 1-13, 1-13.5, and 1-14 of this Act and in accordance with generally accepted government auditing standards. The regulations may specify separate or particular standards applicable only to audits of federal grants, aid or trust funds administered by State agencies in order to comply with applicable federal regulations. Post audit standards established under this paragraph shall govern all post audits conducted by the Auditor General.
The Auditor General may adopt regulations making such standards applicable to financial audits, compliance audits, and other attestation engagements conducted by State agencies of local governmental agencies or private agencies which are grantees or recipients of public funds of the State or of federal funds not constituting public funds of the State through projects administered by that State agency. Notwithstanding any other statute to the contrary, those regulations shall govern the audits to which they are expressly applicable.
The Auditor General may make regulations providing for the ordinary use of compliance audits conducted by State agencies or by certified public accountants as part of financial audits, if such compliance audits comply with the standards and regulations applicable under this Act.
30 ILCS 5/3-6