Earlier quoted context omitted.
It really doesn't seem like the courts agree that you have a right to travel via car without a visible plate.
The courts made polygraphs submittable legal evidence used to convict people, and still use them on people under supervision (because lesser standards apply). Precedent is often crap and wrong until someone can find a good case paired with good lawyers to rectify. Edit: Throttled so editing to reply Precedent is randomly set by whoever gets there first often with a random case and a defendant with zero funds desperat…
"Precedent is often crap" isn't really the basis for any cohesive judicial philosophy or legal thought process.
I'm not aware of any precedent anywhere that approaches "ALPRs violate 4A" territory, it's when other stuff happens that's beyond simply "$lp_id was seen by $camera on $datetime" that I've seen courts start to talk about reasonableness and privacy.