10 ILCS 5/24-3
The State Board of Elections shall appoint 2 mechanical experts to examine voting machines. No member of the board nor their appointees shall have any interest in any voting machine. Any person or corporation owning or being interested in any voting machine may apply to said board to examine such machine and report on its accuracy, efficiency, capacity and safety. The experts shall examine the machine and make full report thereon in the office of the State Board of Elections. They shall state in the report whether or not the kind of machine so examined complies with the requirements of this Article and can be safely used by voters at elections under the conditions prescribed in this Article. If the report be in the affirmative upon said questions, the machine shall be deemed approved by the board and the machines of its kind may be adopted for use at elections as herein provided. When the machine has been so approved any improvement or change that does not impair its accuracy, efficiency, capacity or safety shall not render necessary a re-examination or re-approval thereof. Any form of voting machine not so approved cannot be used at any election. Each of the 2 mechanical experts shall be entitled to $100 for his compensation and expenses in making such examination and report, to be paid by the person or corporation applying for such examination, which sum may be demanded in advance of making the examination, and which shall be the sole compensation to be received by any such expert. The board may, if it consents to do so, go to any point in the state for the purpose of examining a machine, but it shall not be compelled to make such examination at any place other than the capital of the state; Provided, that each of the 2 mechanical experts shall not receive and retain to exceed $1500 and reasonable expenses in any one year, and all sums collected for such examinations over and above said maximum salaries and reasonable expenses shall be turned into the State Treasury.
10 ILCS 5/24-3