Introduction

In March of 2015, the National Institute of Health issued a challenge to create a “Wearable Alcohol Sensor Challenge” that could discretely measure alcohol concentrations in real-time \cite{noauthor_2015-mia}. The winner of the challenge received $200,000 (USD). BACtrack® Breathalyzers (San Fransisco, CA), won the challenge by creating a prototype of a discrete wrist-worn transdermal alcohol monitoring device known as the BACtrack® Skyn™  \cite{noauthor_2016-ed}.  In September of 2019, BACtrack® Skyn™ was made available for research purposes \cite{monitor}. This study evaluated the relationship between breath alcohol (BrAC) and transdermal alcohol (TAC) measurements recorded with the BACtrack® Skyn™ in a subject during three drinking sessions.