[svandamme]

well actually it does matter
was he in a patrol car or in his own personal car?

if he was in a patrol car , on or even off duty i'de say stupid to even try and capture speeding , it's a cop car for crying out loud

if he was in his personal car, out of uniform in my eyes he's just a civvie
and should follow speed rules

still childish to eff around with camera's as a private person, sounds like somebody with to much time on their hands to me, but i don't see how it could be considered stalking , not if it was a fixed setup aimed at speeders in general...