The core problem with license plate readers is that they're not a targeted tool—they're a surveillance network. Every car on the road gets logged, and that data accumulates over weeks and months. A single plate scan tells you where a car was at one moment. A year of scans tells a much more intimate story: where you sleep, where you pray, who you visit, when you seek medical care. That's exactly the kind of information the Fourth Amendment was designed to protect. We don't need a warrant to check a specific plate as part of a specific investigation. But we absolutely should need one to run a system that collects everything about everyone on the off chance it might be useful later. The government shouldn't get a backdoor to build a location history on every citizen just because it's technologically convenient. That's a fishing expedition, not an investigation. And the law should treat it that way.

The practical consequence of requiring a warrant is that you still catch the minivan, but you don't build a permanent map of everyone's life to get there. Warrants have emergency exceptions. If a child is abducted, that's exactly the kind of exigent circumstance where officers can act immediately and get judicial approval after the fact. So the rescue isn't slowed down. What a warrant requirement does slow down is the quiet, warrantless collection of every plate in town, every day, for months on end. That's not a quick check for a specific suspect. That's a surveillance database. And the fact that plates are visible in public doesn't make a year of location history public. My plate is on display, but the story of where I sleep and who I visit is not something I've exposed by driving. The real question isn't whether we can read a plate. It's whether the government can compile everyone's movements forever without ever showing a judge probable cause. I think the answer should be no.

Isn't the point of a warrant to decide before the search whether it's justified, not after? Retention limits and audits are nice, but they only control what happens to the data after it's already been collected. The police still get to build a massive location database on everyone without ever showing a judge any probable cause. That's the problem. And a warrant doesn't have to mean delay. Courts handle emergency requests around the clock, and exigent circumstances like an abducted child let officers act first and get approval right after. So the minivan gets caught either way. Your plan keeps the surveillance and just promises to be careful with it. That's not the best of both worlds. That's trusting the government to monitor everyone as long as they write good policies. A warrant requirement is the one thing that actually forces justification before the dragnet switches on.