If you're a regular wine consumer, you can no doubt remember some occasions when you've had too much to drink. While you shouldn't be drinking and driving at all, at least developing a self-awareness of your exact blood alcohol level by using a breath alcohol testing device can help modulate your consumption or stop you from driving drunk.
In the future, you might also encounter an alcohol breath testing service as you depart a corporate or private event. Springwise, the global trend-spotting site, posted a brief story about Blow Me, a UK-based company offering such services. With a name like that, it's hard to believe they haven't been in the news more often.