720 ILCS 5/17-21: Obstructing service meters.

A person commits obstructing service meters when he or she knowingly, and, with the intent to defraud, tampers with, alters, obstructs or prevents the action of a meter, register, or other counting device that is a part of a mechanical or electrical machine, equipment, or device that measures service, without the consent of the owner of the machine, equipment, or device. A violation of this Section is a Class B misdemeanor.