scrutineer

Etymology
From.

Noun

 * 1)  A person who scrutinises; a person responsible for scrutineering.
 * 2)  A poll-watcher.
 * 3)  A person who observes any process which requires rigorous oversight.
 * 1)  A person who observes any process which requires rigorous oversight.

Verb

 * 1)  To scrutinise; to thoroughly check that an election is being run fairly, or that a vehicle meets the rules of a competition, etc.