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Generally speaking, drug use can be detected on a fingernail drug test for 3-6 months, so it typically would not detect drug use for 10 months. However, if nail growth is slow in an individual, it is possible that the period of detection could be longer in an individual.
It is important to note that environmental exposure to cocaine and failure to wash our hands would not cause a positive result for benzoylecgonine. The bezoylecgonine is a metabolite of cocaine, so is usually detectable because of metabolism of cocaine in the system. For an environmental exposure to cause a positive result for benzoylecgonine, it would require exposure to benzoylecgonine.
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