Detection Windows The window to detect the presence of a particular drug in a personâs urine is highly dependent on multiple factors, such as: Hydration-More dilute urine from high fluid intake may cause dilution of drug and therefore a negative result due to levels present but below the cutoff.
Alcohol flush reaction. Alcohol flush reaction is a condition in which an individual develops flushes or blotches associated with erythema on the face, neck, shoulders, and in some cases, the entire body after consuming alcoholic beverages.
It isn't, it's a defect in the enzyme pathway (the defect is either inherited, or induced by medication) which breaks down alcohol, so that instead of the normal waste products, a surplus of acetaldehyde is produced. The acetaldehyde is what causes the symptoms of flushing and nausea.