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is any system of coordinated measures for apprehending criminals or suspects; including road barricade
Barricade, from the French barrique , is any object or structure that creates a barrier or obstacle to control, block passage or force the flow of traffic in the desired direction...
s and traffic stop
A traffic stop, commonly called Being pulled over, is a temporary detention of a driver of a vehicle by police to investigate a possible crime or civil infraction. In constitutional law in the United States, a traffic stop is considered to be a subset of the Terry stop; the standard set by the...
s, widespread DNA
Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...
tests, and general increased police alertness. The term derives from a fishing technique of dragging a fishing net
A fishing net or fishnet is a net that is used for fishing. Fishing nets are meshes usually formed by knotting a relatively thin thread. Modern nets are usually made of artificial polyamides like nylon, although nets of organic polyamides such as wool or silk thread were common until recently and...
across the sea bottom, or through a promising area of open water.