By Natasha Baker TORONTO (Reuters) - Before getting behind the wheel after a night out, a driver can test his blood alcohol level with new apps that not only give a reading but can call a cab. Breathometer, for iPhones and Android smartphones, and BACtrack, for iPhones, display a user's blood alcohol level within seconds on smartphone-connected breathalyzers. "People think, ‘Oh, I'm driving around the corner,' but it's not until they get pulled over that they realize they're over the limit," said Charles Michael Yim, chief executive of Breathometer, based in Burlingame, California. More than ...

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