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theres a old trick all you have to do is put rubber washers behind the plates so when you are going a bit quicker the plates are vibrating so they cant get a proper shot
I have seen evidence that they dont work they look similar to the old fashioned pictures that are a sort of 3d when you view from a different angle you are not supposed to be able to see it.I suspect that if the plod goes past they will be a bit suspect when they notice a dissappearing number plate.