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.
Alcohol -> Acetaldehyde -> Acetic acid. Asians are actually better at converting alcohol to acetaldehyde. The problem is that acetaldehyde is the thing that causes the flush reaction (asian glow), which turns your face red, among other things. What 50% of Asians are worse at is converting this acetaldehyde to acetic acid (50% of them have this gene).