A new device from David Steele Enterprises works as a Breathalyzer attachment for an iPod or iPhone.
For more information, go to:
http://www.davidsteele.com/ibreath-ipod-breathalyzer-p/ib-1000.htm
http://www.latimes.com/business/la-fi-idrunk19-2008dec19,0,3073178.story
