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:
South Carolina Each candidate who is not unopposed in a primary and each nonpartisan candidate, including announced write-in candidates in a general or special election, may appoint a watcher for any voting place where his name appears on the ballot. However, in any general or special election, all candidates who are certified by a political party must be jointly represented at each polling place by not more than two watchers from the party for each one thousand registered voters or fraction thereof registered at the polling place. Each watcher appointed hereunder must be a qualified voter in the county where he is to watch. (S.C. Code Ann. § 7-13-860)
It is the duty of the managers of election to, and any elector or qualified watcher may, challenge the vote of a person who may be known or suspected not to be a qualified voter. However, the challenges by persons other than a manager must be addressed to the manager and not directly to the voter. (S.C. Code Ann. § 7- 13-810)