Substance Abuse Professional
DOT return to work process, substance abuse tests

`Negative-Dilute Test Results


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In addition to positive and negative DOT drug/alcohol tests there is another test result: Negative-Dilute which is used to describe a result when no drug was found in the specimen. The rule requires the medicalreview officer (MRO) to interview those donors whose specimens are reported as substituted, adulterated or invalid. Validity testing is now mandatory for all specimens. Validity testing is a process used to detect attempts to change (adulterate) a urine sample to achieve a negative result.
Employers can retest all Negative-Dilutes Pre-Employment test results, but not retest all Negative-Dilute Random or other test types.
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Category Posted: General


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