I'm really torn on this one. I've never been one to drive under-the-influence. I did once, for about a mile to my house from a friend's at 3am in a dead suburban town, and I'm still not proud of that. While this technology wouldn't directly affect me, per se, I still worry about this level of control. Imagine a scenario where you're in the middle of nowhere, maybe with a few friends, you've had a few drinks, and suddenly, an emergency arises. You're attacked by an armed perpetrator, a wild animal, someone gets injured, etc... There's no cell service, and you need to get the hell out of dodge ASAP, but your car won't let you drive because your BAC is a point too high. That is one (extreme) scenario where I think driving under-the-influence could be argued for, and even encouraged - but this technology could prevent someone from getting urgent medical care. I know it's a stretch, but it's cases like this that concern me when it comes to technology that can directly override you like that. Just a thought.