I'll toss out another alternative idea. Not that I'm against the warrant requirement exactly but I just think it becomes a lot more fuzzy since the data will be managed by private companies that only accumulated it because they already have other ways to monatize it. And it's only one tool that they have to harass people.

This is fundamentally a police officer problem. You make it a felony and a terminable offense. You make all or part of the Brady List public and this automatically places an officer on it. ALPRs are just one tool for a police officer to stalk someone, they could just as well park outside their house or place of work and follow them around or do other things. We could require warrants to get the ALPR data but we'd still have these jerks pretending in to protect and serve.

In my perfect world, if we had an Amber alert or we knew there was a particularly violent criminal driving a specific car with a specfic license plate, I think it would be a step forward if all of the information was made available quickly and there was a quick and safe capture. Judges can issue warrants pretty quickly when motivated. Likewise, if some officer is stalking his ex-wife or something, cutting off the license plates is a nice step but I'd rather him not be involved in law enforcement at all.

I'd love for these datasets to be fully audited, but I suspect industry will balk that the very use of it is proprietary.