Only if he has his radar gun on. Radar detectors are not cop
detectors.
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Radar detectors are legal. Radar scramblers however are NOT
legal.
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The best radar detectors on the market are made by Beltronics.
Beltronics is a leading manufacturer of the Vector, Professional,
and Express radar and laser detectors.
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Laser detectors detect laser speed devices and Radar detectors
detect radar speed devices.Unfortunately it's usually too late when
they detect Lasers.
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Radar detectors are legal to use for all non-commercial vehicles
in 49 states. Washington, DC and Virginia are the only two states
that radar detectors are banned in the United States. Radar
detectors used in commercial vehicles are illegal.