10 ILCS 5/24-8
Location of voting machines; time allowed for voting; pollwatchers. The exterior of the voting machines, and every part of the polling place shall be in plain view of the election officials. The voting machine or voting machines shall be placed at least one foot from every wall and partition of the polling place and at least three (3) feet from any election officials or table used by them, and it shall be so placed that no person can see or determine how the voter casts his vote. After the opening of the polls, the election judges shall permit within the proximity of the voting machine or machines at any one time, not more than twice as many voters waiting to vote, as there are voting machines in use in that election precinct or district. They shall not themselves remain or permit any other person to remain in any position or near any position that would permit one to see or ascertain how a voter votes, or how he has voted. No voter shall remain within the voting booth or compartment longer than four (4) minutes, and if any voter shall refuse to leave after the expiration of four (4) minutes, he shall at once be removed by the election officials, or upon their order; provided, however, that one election judge may station himself at the side of the machine or machines for the express purpose of actuating the entrance knob, or other device so the voter can operate the voting machine and also in a primary, to set the primary lever or device, so as to enable the voter to vote in the party of which he is a member and to prevent the voter from voting for the candidate or candidates in any other party. The voting machine or machines shall be so placed in the polling place that the ballot labels on the face of the machine can be seen plainly by the precinct election officials and pollwatchers when not in use by the voters. The election precinct officials having charge of each machine shall inspect the face of the voting machine after each voter has completed the casting of his vote to see that the ballot labels are in proper position and that the machine has not been injured or tampered with, and after any voter has voted, the precinct election officials having charge of the machine shall, upon request, permit any pollwatcher to inspect the face of the voting machine to see that the ballot labels are in proper position and have not been injured or marked upon and that the machine has not been tampered with. If it shall be found that such mutilation or marking shall have occurred, the election board shall immediately notify the custodian of the voting machines, or the officer or board having charge of the preparation of the machines, and such custodian or officer or board shall forthwith replace such ballot labels with new ones. Pollwatchers as provided by law shall be permitted to carefully check the voting machine and its protective devices, and ballot labels and registering counters, before the polls may be declared open on election morning, and they shall be permitted to remain in the polling place at all times throughout the conduct of the election if desired, and after the close of the polls, to be present and check the protective devices and registering counters of each voting machine, and the official return sheets thereof.
10 ILCS 5/24-8