I have a Valentine. While driving home today, I was followed by another car for a long way. Nothing sinister about that, it is a narrow, winding country road. 

I'm as sure as I can be that the other car was not police. Yet the entire way my laser detector kept going off every few seconds for short bursts of time. This lasted about 20 minutes. I couldn't see well into the car so don't know if there were children in it.

I often also get brief laser hits in places where there probably are no police speed checks. I usually attribute these to someone playing with a pointer. But today's experience makes me wonder if there is something else going on. Do modern cars have any devices that would set off laser detectors? Is there anything, other than someone playing with a pointer, that would cause this?