While both casing and surveillance involve the act of observing a location or target, they differ significantly in their formality, intent, operational scope, and legal context. Casing is an informal, often illicit term—frequently used in criminal contexts like casing a joint—where an individual secretly scouts a building or area to evaluate security vulnerabilities, entry points, and layout details for an upcoming unauthorized activity or robbery. Surveillance, on the other hand, is a formal, systematic, and continuous observation of behavior, places, or communications conducted by law enforcement agencies, private investigators, or security professionals using advanced technology, established protocols, and legal authorization to gather intelligence or prevent illegal acts.
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