The main activity of a private investigator-detective is investigation.
A detective investigates and collects informations and analyzes evidence. Detective services includes undercover and public work in industry, family protection, the cases of juvenile delinquency, marriage problems, searching for missing persons and objects, and all the other types of bad consequences that normal persons and legal entities can suffer. A private detective is often hired by a lawyer and insurance companies to collect evidence very important for the court verdicts.