emote monitoring of alcohol has been shown to help reduce alcohol consumption \cite{Dougherty_2014}. Concerned parents or guardians could require minors to take random breath alcohol tests. Individuals wishing to reduce alcohol consumption could allow approved third parties such as family or friends to monitor the results of breath alcohol tests, providing an incentive to remain sober. 
In recent years, the Quantified Self movement and the growing demand for self-tracking instruments have expanded to record nearly every aspect of daily life \cite{Swan_2009}. While conflicting evidence exists over the health effects of alcohol use \cite{Rehm2003a}, self-tracking may allow more autonomous control over health-related medical decisions \cite{Gimpe2013}.

Drinking Establishments

Establishments serving alcoholic beverages have an interest in ensuring that their customers do not pose a traffic safety hazard to others as they leave the establishment. Several investigations have looked at efforts made by drinking establishments to discourage drunk driving, including monitoring of alcohol levels. Unfortunately, studies found that efforts failed to curtail drunk driving or had a negative impact \cite{Lang1998,Nau1993a,Russ_1988}.