I was driving down the Turnpike today and noticed a PSP trooper in a marked crown vic sitting on a curve hitting traffic coming towards me. The location he was sitting was not that great and I expected to see the window mounted radar gun. But to my surprise, he was shooting a Falcon HR lower powered gun into the drivers side mirror into oncoming traffic. I thought I saw this about a month ago on I 81, but was not sure. Today a got a great look at the side mirror shot.
Not sure if this is approved by PENNDOT, but the ticket will say radar or something to that effect, and not side mirror radar. I know it works, as in getting a reading, not sure if it is accurate though. Any thoughts? Would this decrease the already low range of this gun? I guess the cop can look through the mirror to get the visually estimated speed but only has a narrow field of view can be argued as inadequate in court and if two cars are next to each other, how does the cop know what car he hit through the mirror? Mirrors can be flat or convex or magnified or tinted. What happens to cosine error? I guess all of that does not matter, as the cop will likely not write acquired speed through side mirror.