(10 ILCS 5/24A-14) (from Ch. 46, par. 24A-14)
    Sec. 24A-14. If any ballot is damaged or defective so that it cannot properly be counted by the automatic tabulating equipment, a true duplicate copy shall be made of the damaged ballot in the presence of witnesses and substituted for the damaged ballot. Likewise, a duplicate ballot shall be made of a defective ballot which shall not include the invalid votes. All duplicate ballots shall be clearly labeled "duplicate", shall bear a serial number which shall be registered on the damaged or defective ballot, and shall be counted in lieu of the damaged or defective ballot.
(Source: Laws 1965, p. 2220.)