Surveillance, for the purpose of this text, is the act of keeping persons, premises, and vehicles under observation with the view towards acquiring knowledge of the identities and activities of persons, and of the use of vehicles and premises. The surveillant is the person who performs the act of surveillance. The person, premises, or vehicle under observation is the subject. The term "surveillance" has commonly used synonyms such as "tailing," "shadowing," "covering," and "observing."
This training guide for new BATF Agents, published in 1977, teaches the basics of physical surveillance.
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