Individuals who abstain from alcohol do not have detectable levels of EtG, or ethyl glucuronide, in their urine, reports Drug Testing Network. Ethyl glucuronide is only produced in the body after drinking ethanol. However, exposure to nonbeverage alcohol products such as mouthwash can produce detectable levels of EtG in urine.
A study in the Journal of Analytical Toxicology reports that individuals with no history of alcohol use tested positive for ethyl glucuronide after topical application of ethanol-based hand sanitizer. One study found that individuals who rinse with mouthwash exhibit elevated EtG levels in the urine up to 120 nanograms per milliliter, reports NMS Labs. However, the urine concentration of EtG from false positives is significantly higher when alcohol is deliberately ingested and can exceed 250 nanograms per milliliter.