Also, a reminder that ALPR abuse predates Flock. Flock has just made it more visible. About a decade ago I personally heard a cop let it slip that he had plate-stalked someone for the crime of saying mean things about his department on Twitter. The difference today is that more departments have access to these kinds of tools.

Fixed ALPRs aren't the only privacy problem, either. Many tow trucks have roving ALPRs that feed into big databases. The notion is that it helps them repossess cars that might be garaged at home. That data, however, is for sale to third parties.