Many of my colleagues in the police air support industry, still monitor and occasionally contribute to this main 'rotorhead' forum. It's still a favourite haunt. The 'new' forum added to Pprune, called "PAS" is a private forum for certain individuals within this service provider company. No other police pilot can enter this forum.
There is another site: "The European forum" where anyone related to / interested in police ops can join. This is still in its infancy and growing.
We're still here ...collating information