Alcohol breath tests: gross errors in current methods of measuring alveolar gas concentrations.

Transitory contact of ethanol with the mucous membranes of the mouth or nasal passages, or both, is sufficient to drastically alter measurements of concentrations of ethanol in so-called "alveolar" gas for more than 20 minutes after such contact. Various concentrations of ethanol were taken into the mouth by human subjects and were expectorated. Readings of… (More)