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Traffic "Cops" use FMCW radar, as they can be very low power and work off batteries. LADAR is also used and this makes the beam much narrower as the wavelength is higher, it should be more accurate but is more likely to suffer from atmospherics. Yes, for speed metering. Radar can be detected by consume hardware, which is illegal in many states. Most police forces have moved to laser because it is more accurate, is difficult for a speeder to contest in court, and is almost impossible to detect until it's too late.

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