Here is a link to the Wall Street Journal they published on ETG and it's pit falls as a tool to monitor sobriety. There is also info in a landmark case schedule to be heard later this year that may set a legal standard for fighting
"accidental Positive" etg's

To get the article call the 800 number on the site - they'll as you a bunch of questions and try to get you to subscribe - but they will also e-mail the article for free.

http://online.wsj.com/public/search/...DS=ETg&x=5&y=7

Peace and Namaste

Hppygr8ful