In Denmark the have talked about an alcohol-lock, so you can only start the car if you breathe into a tube. But that is probably easy to cheat if you want to.<p>Oh, it seems like it already exists: <a href="http:&#x2F;&#x2F;alcolockusa.com&#x2F;compliance&#x2F;index.php?route=common&#x2F;home" rel="nofollow">http:&#x2F;&#x2F;alcolockusa.com&#x2F;compliance&#x2F;index.php?route=common&#x2F;hom...</a>