New device may end drunk driving?

Friend and compatriot PGuy pointed me to this story about a new device that would be built into new cars that would prevent the car from starting if the driver shows evidence of having too much alcohol in their blood. The technology would sense it from the driver's skin through the steering wheel: New device may end drunk driving The News is NowPublic.com. He asked if I thought it raises privacy issues.

I don't really see privacy issues per se, unless the thing records the readings. But I'm not sure it's a good idea. Those most likely to otherwise drink and drive will bypass the system or will hit the reefer if they intend to take the car home.

I just wonder where these things will end. A sensor that you're too tired, too jittery, too easily distracted, listening to an iPod, eating a cheese burger, have squabbling kids in the back?