Work continues on an amendment. We have had good discussions with the MN Dept of Health on language, and expect to post the final revised amendment shortly. The main points are that homebrewed beer and wine presented in tastings may not be produced in equipment that allows toxic substances to enter the liquid, e.g., lead or zinc, and that the brewer needs signage that indicates the beverage has not been licensed or inspected, who the brewer is and that people over 21 may consume at their own risk.
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Modern breathalyzers work on a clever electrochemical principle. The subject's breath is passed over a platinum electrode, which causes the alcohol to bind with oxygen, forming acetic acid. In the process it loses two electrons, a process that sets up a current in a wire connected to the electrode (the higher the concentration of alcohol in the breath, the greater the electrical current, which can be read by a simple meter to indicate intoxication levels).