When is a surveillance is appropriate?

dcinvestigators.co.uk — (1) Surveillance of individuals for matrimonial or domestic litigation or for insurance or disability fraud, (2) To establish an unfaithful partner or to confirm or to disprove adultery accusations, (3) To prevent vandalism, shoplifting or employee theft, (4) Surveillance of pedestrian or vehicle movement, (5) To gather factual (real-time) evidence