10 ILCS 5/24-1
The election authority in all jurisdictions when voting machines are used shall, except as otherwise provided in this Code, provide a voting machine or voting machines for any or all of the election precincts or election districts, as the case may be, for which the election authority is by law charged with the duty of conducting an election or elections. A voting machine or machines sufficient in number to provide a machine for each 400 voters or fraction thereof shall be supplied for use at all elections. However, no such voting machine shall be used, purchased, or adopted, and no person or entity may have a written contract, including a contract contingent upon certification of the voting machines, to sell, lease, or loan voting machines to an election authority, until the board of voting machine commissioners hereinafter provided for, or a majority thereof, shall have made and filed a report certifying that they have examined such machine; that it affords each elector an opportunity to vote in absolute secrecy; that it enables each elector to vote a ticket selected in part from the nominees of one party, and in part from the nominees of any or all other parties, and in part from independent nominees printed in the columns of candidates for public office, and in part of persons not in nomination by any party or upon any independent ticket; that it enables each elector to vote a written or printed ballot of his own selection, for any person for any office for whom he may desire to vote; that it enables each elector to vote for all candidates for whom he is entitled to vote, and prevents him from voting for any candidate for any office more than once, unless he is lawfully entitled to cast more than one vote for one candidate, and in that event permits him to cast only as many votes for that candidate as he is by law entitled, and no more; that it prevents the elector from voting for more than one person for the same office, unless he is lawfully entitled to vote for more than one person therefor, and in that event permits him to vote for as many persons for that office as he is by law entitled, and no more; that it identifies when an elector has not voted for all statewide constitutional offices; and that such machine will register correctly by means of exact counters every vote cast for the regular tickets thereon; and has the capacity to contain the tickets of at least 5 political parties with the names of all the candidates thereon, together with all propositions in the form provided by law, where such form is prescribed, and where no such provision is made for the form thereof, then in brief form, not to exceed 75 words; that all votes cast on the machine on a regular ballot or ballots shall be registered; that voters may, by means of irregular ballots or otherwise vote for any person for any office, although such person may not have been nominated by any party and his name may not appear on such machine; that when a vote is cast for any person for any such office, when his name does not appear on the machine, the elector cannot vote for any other name on the machine for the same office; that each elector can, understandingly and within the period of 4 minutes cast his vote for all candidates of his choice; that the machine is so constructed that the candidates for presidential electors of any party can be voted for only by voting for the ballot label containing a bracket within which are the names of the candidates for President and Vice-President of the party or group; that the machine is provided with a lock or locks by the use of which any movement of the voting or registering mechanism is absolutely prevented so that it cannot be tampered with or manipulated for any purpose; that the machine is susceptible of being closed during the progress of the voting so that no person can see or know the number of votes registered for any candidate; that each elector is permitted to vote for or against any question, proposition or amendment upon which he is entitled to vote, and is prevented from voting for or against any question, proposition or amendment upon which he is not entitled to vote; that the machine is capable of adjustment by the election authority, so as to permit the elector, at a party primary election, to vote only for the candidates seeking nomination by the political party in which primary he is entitled to vote: Provided, also that no such machine or machines shall be purchased, unless the party or parties making the sale shall guarantee in writing to keep the machine or machines in good working order for 5 years without additional cost and shall give a sufficient bond conditioned to that effect.
10 ILCS 5/24-1