(430 ILCS 25/1)
(from Ch. 111 1/2, par. 3601)
No person, firm or corporation shall furnish or supply any natural
gas to any school or public building unless an odor producing liquid is
injected into the gas mains before the gas enters the premises of such
school or public building, so that a strong odor will be noticeable
whenever a leakage of such natural gas exists.
(Source: Laws 1937, p. 487.)