I was just about to post a similar, but much longer email I received on June 20th, regarding ticketing in NJ. I thought that before I post it, maybe I should check Snopes. Read this. Interesting.
http://www.snopes.com/politics/traffic/speeding.asp
My authority is Hubby who is driving in NJ. Usually, he reports an increased "state employee" activity when I tell him about these alerts. Unfortunately, today he hasn't been on major roads.