Illinois Statutes Chapter 815. Business Transactions § 325/4.1. Restricted purchases

(1) materials that are clearly marked as property belonging to a business or someone else other than the seller;

(2) property associated with use by governments, utilities, or railroads including, but not limited to, guardrails, manhole covers, electric transmission and distribution equipment, including transformers, grounding straps, wires or poles, historical markers, street signs, traffic signs, sewer grates, or any rail, switch component, spike, angle bar, tie plate, or bolt of the type used in constructing railroad track;

(3) cemetery plaques or ornaments; or

(4) any catalytic converter or its contents not attached to a motor vehicle at the time of the transaction unless the seller is licensed as an automotive parts recycler or scrap processor.