
Quoting
Litigator
It sounds as though the officer used the pace method. He gets behind a vehicle a certain distance and maintains the same speed as the vehicle he is pacing, looking at his speedometer along the way and follows the vehicle a certain distance. About your only shot is to cast doubt on the accuracy of his speedometer. I do not know when or if it had been calibrated to check its accuracy. While officers go through a certain litany to make sure their radar is accurate immediately prior to using it, it is my experience there is no equivalent litany for a speedometer. It cuts both ways for I've seen people charged with speeding testify that their speedometer showed they were not speeding and then they were generally cross-examined by the prosecutor as to when was the last time that they had their speedometer calibrated for accuracy. The officer's testimony may be backed-up by a visual estimate of speed as well so it is probably a longshot to beat the charge.