I think that's one of the reasons a lot of manufacturers are going to the chipped keys ... the ones that have an electronic code which has to match that of the ignition system in order to start the car. (My Sable has this arrangment.)
I've always been aware of this ... moreso from having lived in numerous apartment complexes that use kwikset keysets. I've always wondered why (other than convenience) they match the deadbolt key to the regular door key ... they should mismatch 'em so that it's less likely that a fellow resident without scruples or burglar can go around trying doors until s/he hits the jackpot.
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