['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier']

06/04/2026

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

§40.97 What do laboratories report and how do they report it?

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: Must a certifying scientist’s signature be on Copy 1 of the CCF if the drug test result is negative?

Answer:

The certifying scientist’s signature must be on Copy 1 of the CCF for non-negative results only.
Therefore, the certifying scientist may simply initial (and date) the CCF when the test result is negative.

['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier']

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