A simple Wearable standalone app that measures the blood alcohol content. Blood alcohol content units differs from country to country - so be sure to set correct units for your place. The simplicity here is the key because sometimes when we are drunk or at the party, we'd rather focus on other people or trying to stand straight rather than dealing with a sophisticated cyber technology.
Of course all necessary settings are provided, like weight of the subject, gender, US or metric units. The app doesn't need to be running all the time to measure the alcohol, after exiting and restarting the alcohol content is preserved (with respect to time that has passed).