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Technologically, it is because you have to establish a chain of trust all the way from the cop, to the radar device, back to the manufacturer, and establish all the way down that nothing was tampered with or miscalibrated.

In the real world that never happens. The judge laughs at you, makes a joke about why you’re wasting your time, and orders you to pay the fine.

One person’s “extracting money from normal people” is another’s “enforcing accountability for those who endanger others’ lives”.

Don’t want to be fined? Don’t speed.

I would argue the opposite. Those who don't speed are disrupting flow of speeding traffic and causing a dangerous traffic impediment. And if everyone stops speeding families suffer fewer necessities healthcare etc as the extra time on road eats into time available to work to provide life saving necessities .

Okay, but if a city has cast-iron proof of the vehicle speeding, then surely they would win back the costs?