Sorry, but that article is utterly biased. It is not a comprehensive, scientific representation of how Lidar works at all. Many of the weaknesses the author points out for Lidar, and gleefully claims do not hinder radar, actually hinder radar to the same or an even worse degree: move the radar gun backward at 4MPH from a wall, and it will also display 4 MPH, knucklehead!
Also, when an officer shoots a target vehicle with either Lidar or radar, the officer is not directly in the path of the vehicle (if he were, he would eventualy be run over!), rather he is to the side of the roadway. That being the case, there is an error introduced into any speed measurement. Both radar and Lidar can only measure the target's velocity directly toward the gun. They do not measure the target's velocity along the roadway.
Now, you might hear the word "error", and jump for joy, but you would be premature to do so. In the field, this is known as the cosign error, and actually benefits the speeder. The reported speed will always be lower than the actual speed, and the descrepency is dependant on how great an angle exists between the radar/Lidar operator, the target vehicle, and the target vehicle's direction of travel.
In other words, the further the officer is off the highway, the lower your reported speed will be on the gun. This is something that your defense attorney hopes will never be brought up by the prosecution.
