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It depends on the employer, but if you work for a transportation company the Department of Transportation says you're supposed to split the sample provided by the employee in half. One of the samples is tested immediately. If you think you're the victim of a false positive, you can pay to have the other half tested at a different lab. Bear in mind, though, that DOT requires Gas Chromatograph/Mass Spectrometer drug testing, which is extremely accurate. If you fail a DOT drug test, you've almost certainly been doing whatever the test says you were doing.

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Q: If you believe a substance has caused a false positive on a drug screen will an employer do a new drug screen or retest the old?
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