In answer to some of the replies that the detection laser do not cast a light upon the subject vehicle.
It doesnt cast a light visible to our eyes.
The principle is still the same.
A laser sight for a rifle or a laser pointer sight generates a light in a certain frequency and spectrum. They are also designed to emmit as small a concentration as possibe.
A laser speed detector still cast a ligh upon an object. We may not with our eyes see it but it is there.
Principles are the same
If I throw a pebble at you or I throw a brick at you. I am still throwing something at you.
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