a person who assesses property, income taxes etc

examiner

a police officer whose job is to investigate a crime

investigator of crime

a kind of small animal used for catching rabbits and rats

person who noses around

a person who inquires

questioner

an official who inspects, e.g. schools, factories; an official who examines (manufactured articles, tickets etc)

examiner

a person (or legal representative) who prosecutes

person who checks thoroughly

a person, ship or small, fast plane, sent out to get information about the enemy; a member of an organization training boys in character, developing self-reliance, discipline and social awareness

person who is searching, investigating

to enquire (into matters one is not concerned with)

person who noses around

of spy

secretly follow, watch another's actions

a person who tries to set secret information, especially about military affairs of other countries; a person who keeps a secret watch on the movements of others

person who secretly finds out about another's business