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I don't see anything in the following info that would allow a car dealer to HP a CR for anything other than a rental or financing:
The above is a capture (quote) from the following website: http://epic.org/privacy/fcra/
As a former auto salesperson the info I found on this website was pretty accurate if your looking for a car it's a good read:
http://auto.howstuffworks.com/buying-selling/car-buying4.htm
as you can see the author also states that running your credit without your consent is illegal I concur.