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Is a watch that doubles as a blood alcohol content tester. An alarm goes off when you go over a pre-set limit (you can choose the limit of dui or when your mouth starts to runneth o'er). I guess you would also need an algorthim to estimate peak BAC based on your parameters.
Whoever made it would be out of business within a year, though. Someone would depend on it to get them home after the party w/o getting a dui and would kill a busload of nuns or something. The made-for-tv movie could be called "When lawyers attack!!!".