Cops Writing Crime - a platoon of realistic crime writing! ABP

I've been playing with this project for a few months now - trying to come up with a list of crime fiction writers who have also been cops (or worked in actual investigations).
The reason I have an interest in this is due to realism.  I've read several of the other ex-cops who write crime, and their depictions of police and police work are spot on, as you'd expect.  In my writing, I always try to ensure police realism.  Some other crime writers I've read, whilst telling a great story, fail to achieve realism when dealing with their cop characters.  And it puts me off as a reader.  No doubt it does for others, too.
So who are the cops or ex-cops who have written crime fiction? 
Well, there aren't many of us...
My list so far numbers 19.  And they are from:  4 here in Australia, 5 in the U.K., 1 in France, and 9 in the U.S.A. 
My next blog will detail the Australians, Brits and Frenchman.  The blog after that will cover the Americans.
Here's to realism!  In my view, this is one of the fundamental underpinnings of good crime fiction.
Cheers,
ABP