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A 'regular' test can only show alcohol in urine until about 12 hours after alcohol intake. Very refined tests (not the kind that people stopped in traffic will face, though) can however detect some by-products caused by earlier alcohol use until about 60 to 80 hours - so 3 to 4 days - after the last alcohol consumption; shorter after only a modest intake, the full 80 days after heavy drinking.

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9y ago

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