Radar guns have been around for many decades. They cost a few hundred dollars and can generate revenue of $1000/day. So why doesn't every police car in existe

Radar guns have been around for many decades. They cost a few hundred dollars and can generate revenue of $1000/day. So why doesn't every police car in existence have a radar gun? The author I was reading claimed that local politicians would not stand for it, I guess because it would be too hard to fix that many VIP tickets. I wonder what the power elite is doing with automated ticket-issuing machines? Maybe the systems come with the ability to erase specific auto-generated tickets for "special" people.