Breathalyzer maker BACtrack today announced the BACtrack Vio, a $49.99 alcohol testing unit that fits on a keychain and feeds the results over Bluetooth to your iPhone or Android smartphone. BACtrack has been making breathalyzers for years, but it didn’t release its first smartphone unit until last year. The new Vio is more compact and affordable than the original BACtrack Mobile. Alongside the product launch, BACtrack has also released an improved app with a better-looking design and new features like the ability to guess your blood alcohol content ahead of time. The Vio is a bit thicker_than a large USB...

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