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How drunk are you?

8:43 AM ET Wed, 26 March 2014

Your smartphone can tell you, says Charles Yim, Breathometer founder & CEO, explaining how his device allows people to check their BAC levels. This is more of a second reference point and not a replacement for good judgment, says Yim. And Kevin O'Leary, "Shark Tank" co-host explains how this device has changed behavior in his home and demonstrates how it works.