Earlier quoted context omitted.
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…
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?
If that camera system is closed-circuit and its data is restricted to the premises they should be permitted to do that.
If the data from that camera system [0] can be removed from the premises by anything less than a search warrant or court order, then no, they should not be permitted to do that.
I know this isn't how the relevant laws work now, but they haven't been adequately updated to account for radical changes in the ability for companies to perform mass surveillance.
[0] ...whether raw or "processed" by -say- a "customer analytics" software... [1]
[1] Want a count of the day's customers? Check register receipts. Want to know what displays are most popular? Ask your employees, or employ someone to take notes. etc, etc, etc.