In Australia, they have mobile speed cameras. Like they are inside of a special car they just park on the side of the road. No warning. Often placed at annoying spots, like the bottom of hills and stuff.
My first and only speeding ticket was going 45 in a 40 (normally 50) zone. Sun was in my eyes, they had a single construction sign up saying 40, with no other stuff around you'd expect in a construction zone.
I was going to contest it, but had already left for Canada by the time it came in the mail.
Should be gaol, and forbidden to own pets for 10 years. After they are out, mandatory unpaid work at animal shelter work (assuming they are repenting).