Los Santos Police Department First Responders
... to a fully functional in-game police radio complemented by role-playing social network accounts. Here's the LSPD Community Relations account giving out public service information to Los Santos' fictional citizens, which we guess is a less embarrassing way to spend your time online than cybering as Sonic the Hedgehog.
Los Santos Police Department First Responders/Twitter
Modders are constantly uploading new missions, which range from action movie material (high-speed chases, terrorist plots) to Cops episodes (catching escaped animals, breaking up fights between delivery drivers). And for those who think that being a cop in Los Santos is still too hardcore: how about becoming an ultra-polite British version, pulling people over for going two miles over the speed limit? There's a mod for that too. The community has gone so far as to replicate real UK vehicles and landmarks to reverse the Revolutionary War and turn Los Santos into London.