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49 CFR Part 40 Subpart O return-to-duty process: A commercial driver’s license (CDL) driver tests positive on, or refuses to take, a U.S. Department of Transportation (DOT) drug test. What must the driver do to be able to resume operating any type of commercial motor vehicle (CMV)?

A CDL driver who tests positive on a DOT test, or refuses to take a DOT test, must successfully complete the return-to-duty (RTD) process with a DOT-qualified substance abuse professional. The requirements for the RTD process are found in 49 CFR Part 40 Subpart O. [See 49 CFR Part 40 Subpart O.]

Last Updated : April 18, 2014