BreathalEyes will watch your eyes and tell you if you're drunk. When the cops pull you out of your car too see if you're too drunk to drive, they might test for Horizontal Gaze Nystagmus (HGN) before they tase you to the ground. HGN is a herky-jerky movement of the eyes, and is one of several field sobriety tests employed by police to see if your blood alcohol level is too high.
And now, of course, there's an app for that.
BreathalEyes uses the iPhone 4's camera to detect a lack of “smooth pursuit.” That is, the subject is told to look as far as possible to one side and the camera watches for fast, involuntary eye movement.
Gadget Lab, BreathalEyes App Detects Drunken (Potential) Drivers
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