Mythbusters tried all kinds of ways to beat both radar guns and the lasor guided equivalent (the Lidar). Those devices were impossible to fool.
However, I do not agree with the police Lt. who says GPS has a delay in the system caused by the satelite which invalidates it. The device on the car records your location and speed. That data is locked in place and transmitted to the satelite. The postal service is late delivering mail all the time, but that doesn't mean the letters you receive are inaccurate because they took a while to get to you.
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Confuscious says~
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