10 ILCS 5/24A-6.1

In all elections conducted pursuant to this Article, ballot cards shall have a security punch. In precincts where more than one ballot configuration may be voted upon, ballot cards shall have a different security punch for each ballot configuration. If a precinct has only one possible ballot configuration, the ballot cards must have a security punch to identify the election. Where ballot cards from more than one precinct are being tabulated, precinct header cards shall also be used: official results shall not be generated unless the precinct identification of the header cards for any precinct correspond. Where the tabulating equipment being used requires entering the program immediately prior to tabulating the ballot cards for each precinct, the precinct program may be used in lieu of header cards.