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This is probably not as useful as it might be unless accompanied by some sort of mobile phone breathalizer widget.

Maybe it can use gyro/camera and ask person to walk on a straight line?

Or activate the microphone, and send the recording to a speech-interpreting API to see if the user has correctly recited "I'm not a pheasant plucker, I'm a pheasant plucker's son, and I'm only plucking pheasants until the pheasant plucker comes"?

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