Who this is for: CDL drivers, fleet managers, owner-operators, compliance assistants
FMCSA Drug & Alcohol Clearinghouse Explained
The FMCSA Drug & Alcohol Clearinghouse is a secure federal database that tracks CDL driver drug and alcohol violations. Employers must query it before hiring CDL drivers and annually for current drivers. Drivers cannot operate commercially while a violation is unresolved.
What the Clearinghouse is
The FMCSA Drug & Alcohol Clearinghouse is a secure online database that contains real-time information about drug and alcohol violations committed by CDL drivers. It was created by a 2016 federal rule and has been operational since January 6, 2020. The database is maintained by FMCSA and is accessible to employers, C/TPAs, drivers, and state licensing agencies.
What is tracked in the Clearinghouse
The Clearinghouse tracks: positive drug test results (under DOT testing); positive alcohol test results (0.04% BAC or higher during or after duty); refusals to test (including no-shows, specimen tampering, and adulterated results); other violations under 49 CFR Part 382; substance abuse professional (SAP) referral and return-to-duty status; and completion of the return-to-duty process.
Who must register and use the Clearinghouse
All CDL drivers must register in the Clearinghouse. All FMCSA-regulated employers of CDL drivers must register and conduct queries. C/TPAs (third-party administrators) managing drug and alcohol testing programs for carriers must also register. Failure to conduct required queries or report violations is a federal violation.
How violations affect drivers
A driver with an unresolved Clearinghouse violation is prohibited from operating a CMV in interstate commerce. The violation remains in the Clearinghouse for 5 years or until the driver completes the return-to-duty process (whichever is later). During this time, any employer running a query will see the violation and the driver's prohibited status.
Who reports violations — and who is responsible
Violations flow into the Clearinghouse from multiple sources, but the reporting obligation rests primarily with the employer. When a driver tests positive on a DOT drug test, the employer — or the C/TPA managing the program — must report it. Refusals to test, including no-shows, specimen tampering, and adulterated results, must also be reported. SAP referrals and return-to-duty completions are the employer's responsibility to report. C/TPAs can submit reports on a carrier's behalf, but the legal obligation stays with the carrier. Medical Review Officers who verify positive lab results have parallel reporting duties of their own.
How the pre-employment query works in practice
Before the driver's first day, the carrier initiates a full query in the Clearinghouse portal. The driver must provide electronic consent through their own Clearinghouse account — which requires the driver to have already registered. Carriers that receive a "no record found" result may move forward. Results showing a prohibited status require the carrier to remove the driver from CDL-required duties or decline to hire. Running the query without waiting for results, or allowing a driver to operate before results come back, is itself a separate federal violation. For most queries, results return within seconds.
Violations follow the driver, not the employer
Before January 6, 2020, a driver who failed a drug test and was terminated could apply to a new carrier — and that carrier had no reliable way to find the prior positive test. The Clearinghouse closed that gap. A positive test or refusal from any registered employer appears in the driver's federal record, regardless of which employer was involved. A new employer will find it in the pre-employment query. This has meaningfully changed what pre-employment screening looks like for small carriers, most of whom previously relied entirely on the driver's self-disclosure and whatever prior employers chose to share.
How state CDL agencies use the Clearinghouse
State licensing agencies have read access to Clearinghouse data. When a driver is in prohibited status, FMCSA notifies the driver's CDL-issuing state. The state then downgrades the CDL to a non-commercial license until the driver resolves the prohibition through the full return-to-duty process. A driver with an unresolved violation doesn't just lose access to CDL employment — they can lose CDL status entirely, which affects any privileges tied to that license.
The return-to-duty process
A driver with a Clearinghouse violation cannot simply wait out the five-year retention period and walk back into a CDL job. To regain eligible status, the driver must complete the return-to-duty process under 49 CFR Part 40, Subpart O: evaluation by a FMCSA-registered Substance Abuse Professional, completion of any prescribed education or treatment, a return-to-duty drug test with a negative result, and a follow-up testing schedule set by the SAP. The SAP and the employer both update the Clearinghouse to reflect each stage. No driver may return to safety-sensitive duty until the record shows the RTD process is complete.
Frequently Asked Questions
When did the Clearinghouse become mandatory?
The Clearinghouse became operational January 6, 2020. Pre-employment queries became mandatory on that same date. All violations occurring on or after January 6, 2020 must be reported.
Can a driver see their own Clearinghouse record?
Yes. Drivers register at clearinghouse.fmcsa.dot.gov and can view their full record at any time, including any violations and their current prohibited or eligible status.
Does the Clearinghouse replace the previous employer inquiry requirement?
Not entirely. The Clearinghouse covers drug and alcohol violations recorded after January 6, 2020. For employment history and violations before that date, the previous employer inquiry under 49 CFR 391.23 still applies. Carriers must do both.
What if a driver believes a Clearinghouse record is wrong?
Drivers who believe a violation was reported in error must work with the employer or C/TPA who submitted it to request a correction. Disputes about the underlying drug test result go through the testing lab or Medical Review Officer process, not through the Clearinghouse portal directly.