Keywords: ethanol, breath analyzer, mouth wash (PubMed Search)
Breath analyzers are commonly used by law enforcment officers to test for alcohol intoxication. Breath analyzer uses ethanol partition ratio between blood:breath of 1:2100 = 1 gm of ethanol in 2100 mL of breath/air.
Mouth wash products are frequently used for oral hygiene, and at times, to "mask" odor of substances. These products are readily available in any grocery stores or pharmacy and contain upto 26.9% ethanol (e.g. Listerine) (18.9% - Scope; 14.0% - Cepacol).
Recently, a small study using healthy volunteers (n=11) was published to investigate the impact of limited ethanol exposure (mouth wash and ethanol vapor) on the breath-alcohol concentration (BrAC).
Blood: No or very low levels of ethanol (0.002 mg/g) were detected in blood at all collection time for both exposures.
BrAC - first collection -- seconds after exposure
Mean time to negative BrAC level (Swedish statutory limit of 0.1 mg/L = 0.01 mg/dL in air) (FYI: US limit = 80 mg/dL)
Ernstgard L et al. Washout kinetics of ethanol from the airways following inhalation of ethnaol vapors and use of mouthwash. Clin Toxicol. 2019 Jun 19:1-7. doi: 10.1080/15563650.2019.1626868. [Epub ahead of print]