Researchers have created a device similar to a temporary tattoo that uses electrodes and a flexible electronic board to accurately detect blood alcohol levels in human sweat, IEEE Spectrum reports. When switched on, a small current runs between the electrodes, and the tattoo releases a drug to induce sweat wherever it is placed. That sweat then reaches an alcohol-sensitive enzyme on the tattoo, which allows the electronic board to estimate blood alcohol content. This one-use sensor has Bluetooth capabilities to work with phones and smartwatches, and it could one day be a cheap and accurate alternative to the painful finger prick or the sometimes unreliable breathalyzer.
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