Can Breathalyzer phone apps tell you whether you're legally drunk?



More and more people are buying portable devices to test blood alcohol level. They're small enough to fit in your pocket, and affordable, costing as little as $50. And they're easy to use: Just plug them into your smartphone and blow to see your blood alcohol content on the spot.

The companies say these apps will help you make smart decisions. But police say they can be unreliable, and, in some cases, could lead to drunken driving.



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