20 ILCS 1605/24
The State Comptroller shall conduct a preaudit of all accounts and transactions of the Department in connection with the operation of the State Lottery under the State Comptroller Act, excluding payments issued by the Department for prizes of $25,000 or less.
The Auditor General or a certified public accountant firm appointed by him shall conduct an annual post-audit of all accounts and transactions of the Department in connection with the operation of the State Lottery and other special post audits as the Auditor General, the Legislative Audit Commission, or the General Assembly deems necessary. The annual post-audits shall include payments made by lottery sales agents of prizes of less than $600 authorized under Section 20, and payments made by the Department of prizes up to $25,000 authorized under Section 20.1. The Auditor General or his agent conducting an audit under this Act shall have access and authority to examine any and all records of the Department or the Board, its distributing agents and its licensees.
20 ILCS 1605/24