ANPR has not been widely deployed since the 1990's in the US and the US court system has consistently held that the degree to which a technology automates monitoring, searching, etc is very relevant to whether it violates people's reasonable expectations of privacy for very obvious reasons.

https://en.wikipedia.org/wiki/Automatic_number-plate_recogni...

> However, ANPR did not become widely used until new developments in cheaper and easier to use software were pioneered during the 1990s. The collection of ANPR data for future use (i.e., in solving then-unidentified crimes) was documented in the early 2000s.