Well, I don't see how it's necessarily illegal under property laws. Safeway didn't damage the car (that's been reported; it's a different story if they did). They didn't share the information they gathered with anyone but law enforcement. And they did it to protect their own property. I don't see how they necessarily need permission to do this. I also don't see how it's any different than them hiring a private investigator to follow these folks.
There's a big difference with your Wal-Mart example. Wal-Mart isn't tracking you to protect their property. Their data would most likely end up being sold, and that would most definitely violate lots of privacy laws.
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