If I run into someone at the grocery store, I can remember "oh I saw them yesterday" if the Police interview me. If I start writing down/logging every time I saw that person at the grocery store and plotting it out, I would consider that "crossing the line".
A Flock camera that receives BOLO's for known-criminals and immediately flags captures in real-time is different than tracking every person going everywhere with a history.
What if the grocery store has a security camera pointed at the door that records 24/7? Should they not be allowed to do that?
I think they should be allowed to point it at places inside their store, with prominent disclosure to people entering.
I don't think they should be allowed to point it at the public sidewalk.
So what if they mount inside pointing outside?
Was "I don't think they should be allowed to" ambiguous?