['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier']

12/16/2025

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Topic Search
Drug and Alcohol Testing - DOT - Drug testing - Motor Carrier

§40.83 How do laboratories process incoming specimens?

RegSense Fleet Safety Drug testing - Motor Carrier Drug and Alcohol Testing - DOT Office of the Secretary of Transportation Focus Area Compliance Docs Standard Interpretation English Transportation USA

Question: If the primary laboratory must redesignate bottle B for bottle A, can the laboratory test the specimen if only 15 mL of urine is present in the redesignated bottle A?

Answer:

The Department permits specimen redesignation only in limited circumstances — one such occurrence would be if the A specimen has leaked in transit, leaving only the B specimen to be tested.
In such a case, the laboratory should test the redesignated specimen despite the fact that, under normal circumstances, a sufficient amount of specimen would not have been available for testing.

['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier']

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