My friend Randy at the fffffatlab made this breathalyzer microphone:
The breathalyzer microphone is a system for the inconscpicuous collection of blood-alcohol content level data sets. In other words, you can measure a personâ€™s sobriety with a device, that for all intents and purposes, looks no different than a standard microphone.
He has also created full step-by-step instructions for the project. I can see it applied in addition to the regular microphone to weight your karaoke score based on how much you’ve had to drink.