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Can someone test positive because of second hand marijuana smoke, or because they ate a poppy seed muffin?

April 26, 2017ate hand marijuana muffin Poppy positive seed smoke Test

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Can someone test positive because of second hand marijuana smoke, or because they ate a poppy seed muffin?

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Drugs are tested for by the lab at fixed cut-off levels, designed to rule out the possibility of second hand smoke, or poppy seed ingestion causing a “false positive”.