(10 ILCS 5/18-15) (from Ch. 46, par. 18-15)
Sec. 18-15.
The poll books shall be enclosed in an envelope, which shall then be securely sealed with sealing wax, or other adhesive material; and each of the judges shall write his name across every fold at which the envelope if unfastened could be opened.
(Source: Laws 1957, p. 1450.)