10 ILCS 5/19-10
Pollwatchers may be appointed to observe early voting procedures and view all reasonably requested records relating to the conduct of the election, provided the secrecy of the ballot is not impinged, at the office of the election authority as well as at municipal, township or road district clerks' offices where such early voting is conducted. Such pollwatchers shall qualify and be appointed in the same manner as provided in Sections 7-34 and 17-23, except each candidate, political party or organization of citizens may appoint only one pollwatcher for each location where early voting is conducted. Pollwatchers must be registered to vote in Illinois and possess valid pollwatcher credentials.
Where vote by mail voters' ballots are processed or counted in the office of the election authority as provided in Section 19-8 of this Act, each political party, candidate and qualified civic organization shall be entitled to have present one pollwatcher for each panel of election judges therein assigned. Such pollwatchers shall be subject to the same provisions as are provided for pollwatchers in Sections 7-34 and 17-23 of this Code, and shall be permitted to observe the election judges making the signature comparison as provided in Section 19-8 .
10 ILCS 5/19-10