In reference to the original post:

This remedy is far worse than the disease, especially when there are alternative ways to attack the theft/fraud problem without infringing nearly so much on privacy.

And just because something might save Dollar money doesn't mean that any of it will be passed to you. Rates aren't set on a cost-plus basis and competition is the main thing driving them. If you want a good case history, check Dollar's rates in Lanai City, Hawaii, where it's the only game in town. Must be a lot of people there giving bogus information and driving the car off the island!

(steps off soapbox)