I’ve written in the past about how most so-called "breathalyzers" do not measure alcohol:  they actually measure the presence of the methyl group in chemical compounds.  One of those compounds is ethyl alcohol (aka ethanol), and the machine simply assumes that the detected compound is ethyl alcohol.  Problem:  there are thousands of compounds containing the methyl group — [...]

Read the complete post at http://www.duiblog.com/2009/05/19/high-breathalyzer-readingsfrom-dieting/