725 ILCS 137/10

A law enforcement agency may not use a cell site simulator device, except to locate or track the location of a communications device or to identify a communications device. Except as provided in Section 15 of the Freedom From Location Surveillance Act, a court order based on probable cause that a person whose location information is sought has committed, is committing, or is about to commit a crime, is required for any permitted use of a cell site simulator device.