Not in the UK they don't ! Every motoring offence is logged on the Police National Computer (PNC). Police vehicles are fitted with Automatic Number Plate Recognition cameras (ANPR). If you drive past a police car with an unpaid traffic ticket, the ANPR will automatically check your number plate against the PNC - and alert the office driving that your car needs to be stopped !
You will then be pulled over, interviewed, and summoned to court to explain why you haven't paid the outstanding ticket.
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