10 ILCS 5/20-10

Pollwatchers shall be permitted to be present during the casting of the vote by mail voters' ballots, 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 between that which is on the ballot envelope and that which is on the permanent voter registration record card taken from the master file.