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.
As a result, acetaldehyde, a toxic byproduct of alcohol, isnât broken down to harmless acetic acid, but instead builds up in the blood and liver. This dilates blood vessels, leading to flushing (redness and heat) in the face, neck, and sometimes shoulders and entire body.