police are sometimes going old school using a stop watch to time your speed between 2 known spots
we moved here in 1972 and my family never got a ticket.
I have seen places like Bloomington (mostly just west of cedar on 98 st / old Shakopee rd. ) were the police have 6 cars parked off a side street and a police officer hiding a block ahead with a radar gun at rush hour ( mostly morning rush hour when people are going to work) pulling people over left and right.

All these road pirates have to do is park a decommissioned squad car with a mannequin in uniform in plane site.
It was tried a few years ago and worked wonderfully, Although it did not generate any money for the police so it was scrubbed.