(65 ILCS 5/11-38-2) (from Ch. 24, par. 11-38-2)
    Sec. 11-38-2. All plumbers or other persons interested in the contract for the plumbing work of a building specified in Section 11-38-1 shall receive a written certificate of instruction from the examining board or officer of a specified city before commencing work on the building and shall proceed according to the plans, specifications, and instructions, as approved by the examining board or officer.
(Source: Laws 1961, p. 576.)