A Detective

1. (law enforcement) A police officer who looks for evidence as part of solving a crime; an investigator.
2. A person employed to find information not otherwise available to the public.

Synonyms

• (law enforcement): DT (abbreviation), Det (abbreviation)
• (person employed to find information): private detective, private investigator
• (person employed to find information): (slang) dick, private dick, gumshoe
• sleuth