Why do we call them coppers?

I remember running down the A1 one night in the 80’s when a driver who i knew from A1 transport called me, he was running behind me and had not been that way before, the guys CB handle was ‘Drifter’ (now dead I think).
The conversation as follows.
“Hey Pat, what are the cops like down this way ?”
My reply “Well, most of them are tall with dark, smart uniforms and some of them wear strange pointy hats” He was not known for his sense of humour and swore at me, but someone else thought it was hilarious and started laughing over the airwaves, we soon found out that the guys name was ‘Skytrain’ and he was a motorway patrol cop, I spoke to him every time I ran that way. Skytrain told me that every Motorway patrol car has a CB fitted. :exclamation: