Or, make a warrant required, and only enable collection of data where a proper warrant for a specific plate is in place start collection, in a granularity of N-days (being as few as one and as many as say 30, without another warrant).
The system should be unable (by design) to store information on plates without warrant.. as you mention, in terms of a ping... No historical logging of data outside that scope.
Cops are able to start following someone... they aren't able to go back in time and start following someone three weeks ago.
True... and barring fictional "investigations" could be challenged in court. The problem is, we're rapidly reaching a point close to 1984 in terms of privacy (or lack of).
The system should be unable (by design) to store information on plates without warrant.. as you mention, in terms of a ping... No historical logging of data outside that scope.
Cops are able to start following someone... they aren't able to go back in time and start following someone three weeks ago.