Agreed. All speed measuring devices are supposed to confirm visual estimates.
I have been, on a number of occasions, the beneficiary of a rabbit in front of me. I have caught laser reflections or pass through from cars in front of me. In the tunnels in Boston, laser has bounced off the wall tiles and my V1 has picked it up.
On another occasion, a MA State Trooper hit me with laser on a blind curve. Since I knew exactly where and when he nabbed me, this served as part of my cross-examination of the officer. However, like how it has happened on all 3 cases that have gotten to the trial stage, the officer did not show and my case was dismissed.
Anyone who says laser detectors are useless is either a liar or ignorant of the facts...