There has been much discussion about whether votes in this next election will be counted securely.
Every state has rules about what poll observers can do at the polls and how votes can be challenged. Here are the rules for your state:
Pennsylvania Each candidate for nomination or election at any election shall be entitled to appoint two watchers for each election district in which such candidate is voted for. Each political party and each political body which has nominated candidates in accordance with the provisions of this act, shall be entitled to appoint three watchers at any general, municipal or special election for each election district in which the candidates of such party or political body are to be voted for. Such watchers shall serve without expense to the county. Each watcher so appointed must be a qualified registered elector of the county in which the election district for which the watcher was appointed is located. (Pa. Consol. Stat. Ann. § 2687)
Any person, although personally registered as an elector, may be challenged by any qualified elector, election officer, overseer, or watcher at any primary or election as to his identity, as to his continued residence in the election district or as to any alleged violation of the provisions of section 1210. (Pa. Consol. Stat. Ann. § 3050).