Scrutineer

A scrutineer (also called a poll-watcher or a challenger in the United States) is a person who observes any process which requires rigorous oversight.

Rules vary concerning the number of scrutineers from a political party who are allowed to be present at each polling station.

In some jurisdictions, each candidate or party may have one scrutineer or poll-watcher per constituency or precinct where voting or counting takes place.

Scrutineers are often required to refrain from contact with voters, from wearing or displaying political slogans, or from otherwise exerting influence on the conduct of the election while it is taking place.

[sentence fragment] Dancing competitions (especially dancesport) employ (usually professionally certified) officials who oversee judging and tabulate scores.

Scrutineer sheet for the 2013 Australian federal election
One formal duty of an election scrutineer involves verifying that the ballot boxes are empty when sealed and that the seals have not been tampered with at the end of polling
Scrutineers inspects a world rallycross supercar at the 2018 World RX of Sweden .