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Regulatory Guidance

Welcome to the FMCSA Guidance Portal. This web portal is a searchable, indexed database that contains and links to all guidance documents in effect from the Federal Motor Carrier Safety Administration. The guidance documents lack the force and effect of law, unless expressly authorized by statute or incorporated into a contract.

To comment on any guidance document, or to request issuance, reconsideration, modification, or rescission of any guidance document, please identify the guidance document in your request and send it to: FMCSAguidance@dot.gov. NOTE: The FMCSAguidance mailbox is not intended to serve as a mailbox for general inquiries. For inquiries that go beyond the limited purpose of the FMCSAguidance mailbox, please call FMCSA's Information Line (800-832-5660) or visit FMCSA's "Contact Us" page to send your inquiry to the appropriate mailbox.

Subject Agency Identifier Topic Issued Date
What identifying number should be documented for drivers in the Clearinghouse? FMCSA-D&A-CLEAR-382.705-FAQ005 Guidance for using a driver’s CDL number and state of issuance in the Clearinghouse
If a medical review officer (MRO) changes a verified positive drug test result per 49 CFR Part 40, when must the MRO submit the change to the Clearinghouse? FMCSA-D&A-CLEAR-382.705-FAQ007 Guidance on when an MRO must report a changed result to the Clearinghouse
What information is a medical review officer (MRO) required to provide when reporting a determination or verification? FMCSA-D&A-CLEAR-382.705-FAQ008 Guidance on MROs Reporting Information to the Clearinghouse
Should an employer report to the Clearinghouse the results of a test conducted under the authority of another U.S. Department of Transpiration (DOT) agency? FMCSA-D&A-CLEAR-382.705-FAQ009 Guidance clarifying that only part 382 violations are reported to the Clearinghouse
What is the Drug and Alcohol Clearinghouse (Clearinghouse) and what information does it contain? FMCSA-D&A-CLEAR-382-FAQ008 Guidance on what is the Drug and Alcohol Clearinghouse
Can Canadian and Mexican substance abuse professionals (SAPs) report the date of initial SAP assessment and date the driver is eligible for return-to-duty (RTD) testing? FMCSA-D&A-CLEAR-40.281-FAQ001 Guidance on Canadian and Mexican SAP Reporting to the Clearinghouse
Can Canadian and Mexican medical review officers (MROs) report verified positive test results and refusals to test to the Clearinghouse? FMCSA-D&A-CLEAR-40.121-FAQ001 Guidance on Canadian and Mexican MRO Reporting to the Clearinghouse
When are drivers subject to the DOT Drug and Alcohol testing requirements? FMCSA-D&A-382.103-FAQ003 Guidance on when a driver is subject to the FMCSA drug and alcohol testing requirements.
ELD Training Checklist for Motor Carriers: Understanding Your Device FMCSA-HOS-ELD-TRAINING-395-FAQ1 ELD Guidance
Brochure provides overview of the hours-of-service rules for drivers of passenger-carrying commercial motor vehicles. FMCSA-HOS-PASS-395-PASSENGER CARRIER HOURS OF SERVICE BROCHURE Passenger Carrier Hours of Service