I've seen it suggested to add a warrant requirement for police to use ALPRs. A warrant requirement is not a reasonable bandaid to consider allowing mass spying. There should be no mass spying by default.

A warrant requirement makes sense for something like the locations of customers on cellular networks, because it's built into the tech.

When you make the optional choice to create mass spying, safeguards do not make it acceptable.

Fun fact, they'd already need one if they weren't buying the data from private companies. This is because both the courts and legislature have been busy desecrating and burying the fourth amendment for decades.