I have a question - how do you think you can build a laser jammer that does not interfere with the measurement but it changes the value of the speed measurement?
Assuming no compulsion to be a completely universal device, let the work on such. Ultralite 100, 200..125. Definitely will not just work on lasers manufactured in Europe with a random distribution of laser impulses.
Why is there no such jammerów the market ??