5 ILCS 430/25-51
When the Legislative Inspector General concludes that there is insufficient evidence that a violation has occurred, the Inspector General shall close the investigation. The Legislative Inspector General shall provide the Commission with a written statement of the decision to close the investigation. At the request of the subject of the investigation, the Legislative Inspector General shall provide a written statement to the subject of the investigation of the Inspector General's decision to close the investigation. Closure by the Legislative Inspector General does not bar the Inspector General from resuming the investigation if circumstances warrant. The Commission also has the discretion to request that the Legislative Inspector General conduct further investigation of any matter closed pursuant to this Section, or to refer the allegations to the Attorney General for further review or investigation. If the Commission requests the Attorney General to investigate or review, the Commission must notify the Attorney General and the Inspector General. The Attorney General may not begin an investigation or review until receipt of notice from the Commission.
5 ILCS 430/25-51