Wristband that can tell if you've been drinking wins US award

Device helps doctors accurately measure patient's drinking history, and not just depend on most recent tests

A San Francisco-based company has won a US government-sponsored competition with an alcohol monitoring devices that can be worn on the wrist, the latest milestone in the development of wearable technologies that monitor and diagnose medical conditions.

BACtrack, a privately held medical device maker, took the $200,000 top prize in the National Institutes of Health Wearable Biosensor Challenge with its wristband monitor - dubbed BACtrack Skyn - which measures blood alcohol levels via sweat on the skin.