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Are you sure it wasn't a news crew or something? I haven't seen choppers doing traffic duty. That sounds extremely expensive. Small fixed-wing airplanes are the usual recipe, and yes they radio reports to patrol cars just as the cars do to each other.
Speed timing used to be done like VASCAR but I'm sure the revenue from a busy area would support newer technologies. As for restrictions on use of RADAR etc., that's rarely been a hindrance. They either use department equipment and staff - if revenue supports it - or just deputize contractors. As for validity of an airborne reading, remember the responding patrol car will probably have paced you or used other readings before pulling you over.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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