Watch a British true crime documentary sometime.
In major cities their cameras can follow a car from a bank robbery half-way to Paris. Or they can follow a woman as she exits a nightclub at 2:00 AM, watch her waiting, and identify when and what kind of a car she got into as well as whoever she talked with in the mean time.
I saw something I should have saved, and didn't. It was about memory having become so inexpensive that every intersection in a medium-sized town could be monitored 24 hours a day, 7 days a week, and the information saved for something like $20,000.
Seriously, youtube has those documentaries and it's a revelation.
