Have like the most recognized police vehicles/textures in a filter in the downloads page.(USA, UK, Germany, Netherlands, France, Belgium, Spain, more..
This is a win-win situation, if you're searching for like a police vehicle in spain, you don't see Dutch(Netherlands) vehicles, and if you put the filter on US, you don't see Spain or Germany.
Yeah you could just search "Polizei, Policia or Politie." but some vehicles have like "2007 Blabla seeds lol" but it's harder to find those in your countries.