You can challenge the equipment by requesting proof that it was properly tested before the shift, radar is checked at start of shift by a tunning fork test. But it is most likely you were under radar long down the road before you knew or saw the officer. And the radar units whle this one may have locked into place, do not have to lock into place and they are not required to even show you the reading. But I doubt you have much luck but you can try.
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