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You are correct that if he was moving the laser would be less accurate.

It is possible to get someone out the window at 500 yds with lidar. I've had readings on cars well over 1600 yds. Since I don't run much speed enforcement, I like to play with the laser if I get one for a day. I can get readings on cars through all the mirrors on my car - including the rearview - which means going through the plexiglass on the cage, and the rear window.

Lidar is cool for sure, but it is only reliable when you're stationary.