BreathalEyes uses the built-in camera to measure your blood alcohol levels by scanning eye movement.

A new iOS app called BreathalEyes claims that it can accurately estimate your blood alcohol content (BAC) simply by scanning the movement of your eyes. The app analyzes your horizontal gaze nystagmus (HGN), something police officers often check in conjunction with the breathalyzer test. HGN is involuntary eye movement that is sometimes caused by alcohol consumption — when your eyes can't move smoothly and often jerk or bounce when looking from left to right.

BreathalEyes uses the built-in camera on the iPhone to record any signs of HGN and gives you a BAC result that's within 0.02 percent accuracy. You simply hold the phone for 10 seconds while it's framed around your left or right eye to be analyzed.

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