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Hope this url works; here's a snippet I found funny;

Quote Originally Posted by article
Price uses a Lidar (light-detection and ranging) gun which clocks the time it takes a burst of infrared light to reach a car, and bounce back to the detector which gives the exact speed of a car from greater distances quicker than radar.

“When I went through the academy, I had to do 100 correct visual speed estimations to be reliable to testify in court,” Price explains as he points the device at a car heading west. He estimates the car is doing about 50 in a 35 mph zone. The Lidar readout indicates 53.

“I was off by only three miles per hour,” said Price after issuing a speeding ticket to the driver who was heading to Creekside school to pick up a child from a dance.
Off by 3mph is still off, no one is 100%

Edit bah, 100 correct VE's not 100% correct, still an interesting article