A scrutineer is a person who checks that an election or a race is carried out according to the rules.
[British]
scrutineer in British English
(ˌskruːtɪˈnɪə)
noun
a person who examines, esp one who scrutinizes the conduct of an election poll
scrutineer in American English
(ˌskruːtnˈɪər)
noun
chiefly Brit & Canadian
an official examiner, esp. of votes in an election
Word origin
[1550–60; scrutin(y) + -eer]This word is first recorded in the period 1550–60. Other words that entered Englishat around the same time include: coach, residual, scanner, section, vertical-eer is a noun-forming suffix occurring originally in loanwords from French (buccaneer; mutineer; pioneer) and productive in the formation of English nouns denoting persons who produce, handle,or are otherwise significantly associated with the referent of the base word (auctioneer; engineer; mountaineer; pamphleteer); now frequently pejorative (profiteer; racketeer)