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They are legal,but Snooper are just GPS radars(which work on Subscription basis,and for this job i would rather recommend GPS aka Garmin or TomTom with radars POI),i would recommend rather Valentine V1 or V2
My mate got one through their website cheap. Reconditioned model I believe. He swears by it, although I think it's a bit dated now (2 years old) He can download static camera locations as well for a fee.