625 ILCS 5/4-206

When the registered owner, lienholder or other person legally entitled to the possession of a vehicle cannot be identified from the registration files of this State or from the registration files of a foreign state, if applicable, the law enforcement agency having custody of the vehicle shall notify the Illinois State Police, for the purpose of identifying the vehicle owner or other person legally entitled to the possession of the vehicle. The information obtained by the Illinois State Police will be immediately forwarded to the law enforcement agency having custody of the vehicle for notification purposes as set forth in Section 4-205 of this Code.