During surveillance the private investigator will use various surveillance techniques. (video and audio). During surveillance the private investigator observes and records the subjects movements and interactions. Surveillance on employees to watch for theft can aid to solve the crime. Surveillance on your spouse or partner or moonlighting business partners. Surveillance is helpful in child custody investigations, worker’s compensation and insurance claims. Surveillance is the close observation of a person, place, or object. Surveillance documents the interactions or whereabouts of the subject! The investigator will provide a visual of the subject and document important information. The private investigator will keep a diary and will get video and audio evidence.