10 ILCS 5/18-8
As soon as the poll of an election shall have been finally closed, the judges of election, in their several precincts, shall immediately, and at the place of the poll, proceed to canvass the vote so cast. Such canvass shall not be adjourned or postponed until it shall have been fully completed, nor until the several statements herein required to be made by the judges shall have been made out and signed by them. The judges of election shall have the right to station one or more police officers or officers of the peace, at such entrance to the room where such canvass is begun, or about to take place, to exclude disorderly persons, and to keep the peace.
Where voting machines or electronic voting systems are used, the provisions of this section may be modified as required or authorized by Article 24 or Article 24A, whichever is applicable.
10 ILCS 5/18-8