[Superman]

Jeff, those have been EXACTLY my concerns, though I have not seen the administrative details you have. Although I am told the industry refuses to disclose the exact mathematical and functional details of the laser gun's operation, we know that its function is not a 'doppler' function. Rather, as you say, they 'locate' a part on the car twice, and make speed inferences based on the two physical locations. If those two locations are not determined using the same car part (license plate), then the inferences would be indefensible. You'd think. But as you know, the issue is not fairness or evidencial. It is financial. Involving the insurance companies and police departments. With motorists as patsies.