Establishing the existence of a violation, while obtaining probable cause for a search warrant and ao preventing crime are all considered to be the effective uses of surveillance.
So, the effective use of surveillance is what helps in order to know whether the suspected criminal activity exists and so it prevents the particular crime committed by allowing the suspects to become aware that they are been watched.
Surveillance however refers to use of covert observation of people, vehicles and places by the enforcement agencies and detectives for investigating the allegations of illegal behavior and violence.
Hence, the surveillance allows to know whether suspected criminal activity exist.
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