http://news.yahoo.com/s/ap/20100525/ap_on_he_me/us_med_alcohol_bracelet
The gadgets are much like the better known electronic ankle bracelets that have been used for years to restrict suspects or parolees to their homes. (The alcohol bracelets can now do that too, if needed.)
The bracelet uses the same technology as a breathalyzer, but instead of checking the breath for alcohol, it samples the perspiration on the skin. After alcohol is consumed, it eventually enters the bloodstream and a small amount is expelled through the skin.
The bracelet tests the skin every half hour. If there's alcohol, it causes a chemical reaction in the device's fuel cell. Usually once a day, the information is sent over phone lines to the company, which alerts the courts or probation officer if alcohol is detected at a blood-alcohol level of 0.02 or higher.
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