Isn't that the same TESTING used on DRUNKS at POLICE STOPS???????
From what I understand they are also cracking down on this now so that if the cops suspect you of driving under the influence you are automatically considered an alcoholic until you can prove otherwise...therapy, AA meetings and the whole nine yards, until such point as you can prove you are not an alcoholic will you get a license back. It's no longer about the commitment to not drink and drive, rather there is movement for no drinking period if you want to drive again.
Like the SMOKING rule? If you smoke in the privacy of your own home, you can be FIRED FROM YOUR PLACE OF EMPLOYMENT.