Re: Sample rate
@Valerion
That'd only be possible if the telematics/gps device had a visible countdown to the next recorded measurement, you accelerated at a rate constant with your future deceleration, and you did all that knowingly in front of a camera van for the purposes of getting nicked. And it won't just be you, it'll be everyone the dodgyscope says was speeding who has telematics.
Not only is it unlikely, its so far beyond reasonable doubt that the SCP could claim Elvis was operating it with no further loss of credibility.
Having two objects move in unpredictable patterns at unknown speeds will always make it impossible for one object to accurately calculate the speed of the other when you're scaling up a distance travelled of a few inches during measurement to generate a speed in MPH. Its time all handheld or otherwise manouverable speed devices were decomissioned. Fix one to a tripod where the operator can't jiggle it, if you must, but lets at least be reasonable about the laws of physics.