Cheers mate!
How are things in
Kiwi land?
With regard to your question, I heard a number of Texas DPS patrol officers discussing this very topic some years back, in fact they mentioned that some "cowboys" were using laser to clock vehicles' speeds approaching from behind while they were moving (bouncing police laser off the side-view or the rear-view mirrors).
I don't suspect that IACP would officially sanction the targeting methodology or even the manufacturers of the police lasers, however, I do believe that it is technically possible.
It's been my experience that the error trapping software of police lasers have evolved (as manifested in Gen III/IV police lasers) to be pretty sophisticated and if anything, I believe, using police laser this way while technically possible probably handicaps the targeting officer more than anything.
Given that the speed of light travels at nearly 300,000,000 metres per second, the laser gun makes a series of pulse-train distance measurements subject to advanced filtering algorithms, and I assume the other targeting variables are essentially constant during the clocking procedure (ie; limited panning errors, targeting the reflection is a consistent manner), I believe it is technically possible to measure the relative closing distance(s) in each discreet measure during your approach behind him.
Whether or not he could actually issue you a ticket that could stand up to a challenge in any given court, is beyond my scope.
However, given your obvious knowledge of the subject, coupled with your observations, I suspect your could either mention it to the officer at the window (at the time of the stop) or at any hearing and it may introduce enough "doubt" to allow some negotiating room for a dismissal.
Perhaps I produce a video, demonstrating the targeting method, if you would like and we could all learn something from it.
What do you say about that?
And, welcome to our forum, mate, it'll be great to have your input and contributions about how things are "down-under."
Cheers.
Veil Guy
