Sorta related: A community near me recently experimented with "automated" parking enforcement. Basically, cameras around a parking space detected if the same car was parked longer than was paid for, and if so, the system fired off a ticket to the registered owner of the vehicle (by OCR'ing the license plate). I heard a few rumors regarding why the experiment stopped:

- people were really PO'ed for getting parking tickets in the mail, days or weeks later.

- cheating husbands were getting caught by their wives: "What's up with this parking ticket from downtown when you told me you were visiting your mother in Big Bear?"

- vandals (heroes?) were spray painting the cameras, then parking for free.