Self-Testing for Your Customers Alcohol Alert is state-of-the-art technology for self-monitoring and is easy to use. The customer just blows through a straw into the machine, and the result is a numerical readout of current blood alcohol content (BAC), and a verbal warning if it indicates potential impairment. Nobody says they want to drive impaired, but most people can’t tell on their own when they’ve had too much. Alcohol Alert doesn’t tell a person whether they can drink or not, it tells them when, for sure, they shouldn’t drive. It’s an idea whose time has come.