What the Clearinghouse is
The FMCSA Drug & Alcohol Clearinghouse is a federal database recording drug and alcohol programme violations by CDL and CLP holders. It exists to close a specific loophole: before it existed, a driver who tested positive for one employer could simply resign and be hired by another carrier that had no practical way of finding out.
It records positive test results, refusals to test, and other programme violations, along with a driver's return-to-duty process where one is undertaken. Employers query it before hiring and annually thereafter, so a violation follows the driver rather than the employer.
Two things make it a frequent audit finding. It's relatively recent, so carriers who built their compliance habits earlier sometimes don't have it in their process at all. And the annual query is easy to forget, because unlike a medical certificate there's no physical document expiring to remind you.
This article reflects my understanding of published FMCSA requirements as a compliance support specialist. It is not legal advice and it is not a substitute for reading the regulations that apply to your operation. Rules change, and requirements differ for passenger carriers, hazardous materials carriers and intrastate operations. Verify everything against fmcsa.dot.gov and the current eCFR Title 49 before acting.
Who has to use it
- Employers of CDL and CLP drivers who perform safety-sensitive functions.
- Drivers holding a CDL or CLP — they must register to give consent for full queries and to view their own record.
- Consortium/third-party administrators (C/TPAs) acting on behalf of employers.
- Medical review officers and substance abuse professionals, who report certain information.
- State driver licensing agencies, which query the system in connection with licensing.
Owner-operators are a special case worth flagging: an owner-operator who is both the employer and the driver must comply with the employer obligations, and is generally required to designate a C/TPA to perform certain functions, because you cannot meaningfully query yourself.
Setting it up as an employer
- Create a Login.gov account. Access to the Clearinghouse runs through Login.gov, which requires identity verification. Do this before you need it — the verification step is where people get stuck at the worst moment.
- Register as an employer at clearinghouse.fmcsa.dot.gov, providing your USDOT number and company details.
- Designate your C/TPA if you use one, granting the permissions you want them to exercise. Be deliberate about this — designating a C/TPA does not transfer your legal obligation, it just lets them do the work.
- Purchase a query plan. Queries are bought in bundles. Buy enough for your pre-employment queries plus one annual query per current CDL driver, with headroom.
- Ask each driver to register and give consent. Drivers must be registered before you can run a full query on them.
The two query types
Limited query
Tells you only whether information exists in the driver's record. It doesn't show you what that information is. It requires the driver's general consent, which can be obtained outside the Clearinghouse system and can cover multiple queries over a period. Limited queries are cheaper and are commonly used to satisfy the annual query requirement.
The catch: if a limited query indicates information exists, you must obtain the driver's electronic consent and run a full query within the timeframe the regulations specify, and the driver may not perform safety-sensitive functions until you've resolved it.
Full query
Returns the detail of any recorded violations. It requires the driver's electronic consent given within the Clearinghouse system itself — which is why the driver must be registered. A full query is required pre-employment.
The employer workflow
Pre-employment
Before a CDL driver performs any safety-sensitive function for you, run a full query and record the result. This is not optional and it is not something that can be done retrospectively. Using a driver before the pre-employment query is a compliance failure of the kind that has real consequences in an audit.
Note also the transitional requirement carriers sometimes miss: alongside the Clearinghouse query, obligations around obtaining prior drug and alcohol testing information from previous DOT-regulated employers exist under the wider regulations. Check what applies to your situation rather than assuming the Clearinghouse query covers everything.
Annual
At least once every twelve months, run a query — limited is sufficient — for every current CDL driver, and record it. "At least once every twelve months" means the interval between queries, not once per calendar year, so a query in January 2026 and the next in December 2027 is a gap even though it hits both years.
When a violation is recorded
If a query returns a violation, the driver is prohibited from performing safety-sensitive functions until they have completed the return-to-duty process with a substance abuse professional, including the required return-to-duty test, and the Clearinghouse reflects that. Follow-up testing then applies according to the SAP's plan.
Employers also have reporting obligations into the Clearinghouse — certain violations they become aware of must be reported within the required timeframe. That's an obligation people frequently overlook because it runs in the opposite direction from the querying they're used to.
Under rules that took effect in late 2024, state driver licensing agencies are required to act on Clearinghouse prohibited status by downgrading the commercial driving privilege of drivers in prohibited status. The practical effect is that a Clearinghouse violation now has direct licensing consequences, not merely employment ones. Verify the current requirements and timelines with FMCSA and your state agency.
Common mistakes
Assuming the C/TPA handles everything. Designating a C/TPA delegates work, not responsibility. If they don't run your annual queries, the finding is against you.
Missing the annual query on long-tenured drivers. New hires get queried because it's part of onboarding. The driver who's been with you four years is the one who gets missed, because nothing in your process ever touches them again. Fix: a query calendar keyed to each driver's hire anniversary.
Running a limited query without valid general consent. The consent requirement is real and it needs to be documented. Get it during onboarding and keep it.
Not registering drivers. You cannot run a full query on an unregistered driver, which means you cannot complete a pre-employment query, which means the driver cannot start. Make registration part of the offer process, not the first week.
Not keeping the query records. Running the query and not retaining the confirmation means you can't prove it. In an audit, unprovable compliance is non-compliance.
A workable Clearinghouse calendar
- At offer stage: driver registers with the Clearinghouse and gives electronic consent.
- Before first safety-sensitive work: full query run, result recorded and filed.
- Hire anniversary, every year: query run and recorded. Diarised with a 30-day advance reminder.
- Quarterly: check remaining query balance so you don't discover you're out of queries the day you need one.
- On any reported violation: driver removed from safety-sensitive duties immediately, SAP process initiated, documented throughout.
Running that calendar reliably across a growing roster is exactly the kind of recurring administrative work that slips. I provide Clearinghouse query tracking and FMCSA compliance support so the annual queries actually get run and recorded.
Section C of the free DOT compliance checklist covers the drug and alcohol programme including Clearinghouse obligations. If you're preparing for an audit, start there and in the new entrant audit guide.
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