['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier', 'Alcohol testing - Motor Carrier']

10/22/2025

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

§40.5 Who issues authoritative interpretations of this regulation?

RegSense English Fleet Safety Drug testing - Motor Carrier CFR Regulations Drug and Alcohol Testing - DOT Office of the Secretary of Transportation Focus Area CFR Section Alcohol testing - Motor Carrier Transportation USA

ODAPC and the DOT Office of General Counsel (OGC) provide written interpretations of the provisions of this part. These written DOT interpretations are the only official and authoritative interpretations concerning the provisions of this part. DOT agencies may incorporate ODAPC/OGC interpretations in written guidance they issue concerning drug and alcohol testing matters. Only Part 40 interpretations issued after August 1, 2001, are considered valid.

['Drug and Alcohol Testing - DOT']

['Drug testing - Motor Carrier', 'Alcohol testing - Motor Carrier']

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