Mercury,
Dont know what your gripe is, but you can safely assume that the police aircraft was not doing whatever it was doing for the purpose of winding you up. They have a job to do, they are doing it as professionally as they can. If it was dusk, it wasnt night (sunset + 30 mins). Even if it was night, perhaps they were concentrating on catching bad guys, and forgot to put their nav lights on for 5 mins or so. Big deal! They can do without verbal sniping, as well as real sniping!