This is exactly why we took our cameras down in nearby Oak Park in Chicagoland.

People talk online as if this is a Flock technology issue, but it only peripherally is. The core problem is that the hotlist systems states set up were never intended for real-time enforcement; there's a great deal of imprecision in them that tends not to matter in human-scale enforcement, but matters a great deal when enforcement is automated.

This distinction is important because there's basically not much Flock can do about it. The source of truth about which cars should be curbed isn't Flock's and can't be Flock's; it's core law enforcement data that belongs to and is the responsibility of the state. Companies like Flock can presumably rig up Rube Goldberg devices to double-check and cross-check hotlist data, but their goals are in tension: they have a window of just minutes to detect and interdict a car. Our police department pledged to do voice confirmations on these hits, and everyone knew that wasn't going to work.

In our specific case, we curbed more innocent vehicles than stolen ones (though not at gunpoint). In each bogus case, Illinois LEADS had left a car recorded "stolen" weeks after it had been "recovered"; "recovered" in scare-quotes because many (most?) of these cars were never stolen to begin with, but rather driven off by a relative without notice. More context on why these data sources are unsuited for real-time enforcement!

Unfortunately, every law enforcement ALPR deployment in the country is a dragnet for all curb-able offenses, from stolen cars to failure-to-appear warrants (the plurality of arrests under our system, which turned our police force into municipal debt collectors for neighboring suburbs). The starting point for mitigating this problem would be to drastically reduce the set of offenses you alert on --- and that's tricky, because your instinct is to reduce them to the most serious offenses, but what you really need is the set of offenses least likely to result in false positives. We settled on "stolen license plate" (no innocent explanation) before giving up on the endeavor entirely.