Method and Materials

The BACtrack® Skyn™ (BACtrack Breathalyzers, San Fransisco, California, USA) is a wrist-worn transdermal alcohol monitoring device. The Skyn™ device contains an electrochemical fuel cell to continuously monitor alcohol vapors emanating from the skin. The device records measurements every 20 seconds and transmits data via Bluetooth® to an app on the user's smartphone. Photos of the device are shown in figures \ref{365666} and \ref{168024}.