430 ILCS 10/5
Whenever any person, or the president, secretary, treasurer, or other officer of any corporation mentioned in Section 2 of this Act, or his, her, its or their duly authorized agent who has personal knowledge of the facts, shall make oath in writing before any judge or associate judge, that the party so making such affidavit has reason to believe and does believe that any of his, her, its or their liquefied petroleum gas containers marked with the name, initials, mark or other device of said owner, are in the possession of or being used by or being filled or transferred by, or that liquefied petroleum gas is being withdrawn from the container by, any person whose name, initials, mark or other device does not appear on said containers, and who is in the possession of, filling or refilling, or using any such containers without the written consent of the owner of such name, initials or trade mark, the judge or associate judge may, when satisfied that there is reasonable cause, issue a search warrant and cause the premises designated to be searched for the purpose of discovering and obtaining the same, and may also cause to be brought before him the person in whose possession such containers may be found, and shall then inquire into the circumstances of such possession; and if such judge or associate judge finds that such person has been guilty of a violation of this Act, he shall impose the punishment herein prescribed, and he shall also award the possession of property taken upon such search warrant to the owner thereof.
430 ILCS 10/5