[quote=@Snaketicus]
I really enjoy the idea of this!
Do you have any ideas for a particular setting? Would this be entirely a normal world? 

[/quote]

Yes. Not sure which country it would be based in - most likely the US as most of us will have seen some kind of detective/cop show originating from there. I don't expect any specific knowledge on locations seeing as I'm based in the UK and aren't very well acquainted with the area either.

If there's a consensus on another location I would be very much open to suggestions.

UPDATE: So I have come up with two options (really): an American city setting or a British town setting.  Obvious differences would be gun laws (even the police in Britain rarely have firearms), diversity and also the frequency of events such as homicides (much rarer in the UK).  Also the British town setting would have more of a community police style - a lot of people would recognise their local officers and would often know each other whereas in the US setting that would simply be implausible.