Versions of Illinois Compiled Statutes 815 ILCS 121/140 - Investigation of complaints on LawServer 2024 Illinois Compiled Statutes 815 ILCS 121/140 – Investigation of complaints 2023 Illinois Compiled Statutes 815 ILCS 121/140 – Investigation of complaints 2022 Illinois Compiled Statutes 815 ILCS 121/140 – Investigation of complaints