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Originally Posted by Perfectlap
no laser can be fired from a moving vehicle. The cop that was following me didn't trip the K or Ka band on my V1, only the laser. And he pulled over the other car after trailing him and not from a sneaky hideout behind a tree.
What impressed me was that detectors will only pick up laser if its pointed directly at the detector. And my V1 picked it up twice.
I think if I'm not mistaken that K and Ka radar guns have to be fired from stationary points (by law in some states). I was told that if you were pulled over to ask to see the the laser gun readout and that the officer was obligated to show it to you. They don't tell you that you have this right apparently.
The V1 was the only detector to pick up laser from a pursuing vehicle in one of the recent evaluations (posted on this forum). Laser certainly travels through glass, isn't that how my EZ-Pass for tolls works?
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I'm quite sure that laser can be FIRED from a moving vehicle, but it cannot be USED from a moving vehicle. It must be directed to a certain spot on the target car and held there to be accurate. All LIDAR units that I'm aware of are hand-held and have a scope with crosshairs or a dot to use for targetting. Even if the officer had a partner trying to use one from the passenger seat, jiggling the laser spot from the rear bumper to the rear glass would yeild an inaccurate result. It is refracted by glass, making the aiming of from inside a moving car pretty much useless.
At 1000 feet, the laser "spot" has grown to about 3.5 feet by 3 feet. At that distance, the laser is pretty much covering the entire back of our cars.
The K and KA bands are totally different, and can be used from a moving vehicle with any aiming needed. They are simply pointed forward, and typically display the speed for the strongest reflection. Glass does not materially affect their signal, and neither does a little bouncing around. While some states may legislate that they can only be used when stationary, that certainly isn't the case in SC.
I don't doubt that the officer in your story was spraying laser around and looking for brakelights, and ended up pulling someone over. I just can't make any sense from the laser part. He can certainly write a ticket by using his judgement and speedometer to say you were traveling X mph faster than his calibrated speedo says that he was. Perhaps he looked for someone to act guilty based on brakelights, and wrote them up on presumed guilt? Like that's never happened before!
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