It's optional for us. I use a hand held radar which locks in the speed. During daylight, I usually tuck it under my arm and then show them during my conversation with them. Not too many questions asked after they see their speed in those bright red blinking numbers.. BTW, I think the people that made the radar did that especially for an influence effect..
Be advised, I'm mean nasty and tired. I eat concertina wire and piss napalm and I could put a round through a fleas *** at 300 yards. So why don't you hump somebody else's leg mutt-face before I push yours in.