The latest brand to come on board with DAD is Alcohoot - already a top-selling brand in the US.  The Alcohoot Smartphone Breathalyser brings Police grade fuel cell technology to the private user for the first time.  

Use the Smartphone app to measure your blood alcohol level - ideally the morning after, to ensure your safety to drive.  The unit is smart enough to calibrate itself, using your smartphone's GPS, to the local legal limits and measurement units.  

The app can track your readings, give historical data, even suggest local eatieries or search taxi information for you if you blow over the limit!

The unit comes with 8 replaceable tips for hygiene and further tips can be purchased.

Be smart, use Alcohoot.