625 ILCS 5/4-202
When an abandoned, lost, stolen or unclaimed vehicle comes into the temporary possession or custody of a person in this State, not the owner of the vehicle, such person shall immediately notify the municipal police when the vehicle is within the corporate limits of any city, village or town having a duly authorized police department, or the State Police or the county sheriff when the vehicle is outside the corporate limits of a city, village or town. Upon receipt of such notification, the municipal police, Illinois State Police or county sheriff will authorize a towing service to remove and take possession of the abandoned, lost, stolen or unclaimed vehicle. The towing service will safely keep the towed vehicle and its contents, maintain a record of the tow as set forth in Section 4-204 for law enforcement agencies, until the vehicle is claimed by the owner or any other person legally entitled to possession thereof or until it is disposed of as provided in this Chapter.
625 ILCS 5/4-202