Ill. Admin. Code tit. 92, § 3280.1050
a) General
The Department may conduct investigations (Section 18b-102(b) of the Law) relating to compliance by any person with any provision of the IMCSR (92 Ill. Adm. Code 340, 380, 382, 383, 385, 386, 387, 390, 391, 392, 393, 395, 396 and 397) and any order issued under, or any court decree relating to, those regulations.
b) Confidentiality
7) obstruct an ongoing criminal investigation.
(Recodified from 92 Ill. Adm. Code 386 (Department of Transportation) pursuant to P.A. 104-0025, at 49 Ill. Reg. 12543)
Information received in an investigation under this Section, including the identity of the person investigated and any other person who provides information during the investigation, shall remain confidential, but only to the extent that disclosure would: