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laser detectors are pretty much useless. The laser beam is extremely narrow as compared to a radar beam. When your detector goes off, the laser is reading your vehicle, and your vehicle only. There is no warning from a stray radar wavelength.
I wouldn't rely on radar or laser detectors as a fool-proof way of avoiding tickets. A good radar operator will only activate his radar when he sees a vehicle he knows is exceeding the speed limit; thus the radar detector will also not go off until the speeder is the target and they are busted.
Save your money and follow the speed limit.
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