Quick Answer
The FMCSA Clearinghouse is a federal database of CDL drivers' drug and alcohol program violations. Employers must run a full query (with the driver's electronic consent) before hiring and a limited query on every driver at least annually. A violation puts the driver in "prohibited" status — barred from safety-sensitive driving, and since late 2024, states must downgrade the CDL itself until the driver completes the return-to-duty process with a Substance Abuse Professional.
Key Takeaways
- Two mandatory checks: a pre-employment full query and an annual limited query on every CDL driver.
- Positive tests, refusals, and program violations all land in the database — a refusal counts the same as a failure.
- Clearinghouse-II (since November 2024) connects the database to licensing: prohibited status triggers a CDL downgrade by the state.
- Owner-operators must both register as an employer and designate a consortium/TPA to manage their testing program.
What the Clearinghouse Is
Before the Clearinghouse, a driver who failed a drug test could quietly apply at another carrier that had no way to know. The database closed that gap: medical review officers, employers, and substance abuse professionals report violations to one federal system, and every hiring carrier must check it. It covers positive drug tests, alcohol violations, test refusals, and actual-knowledge violations.
The Two Queries Every Carrier Must Run
Pre-employment full query. Before a driver performs any safety-sensitive work, the employer runs a full query, which requires the driver's electronic consent inside the Clearinghouse. No consent, no query — and no driving.
Annual limited query. At least once a year, on every CDL driver, the employer runs a limited query that reveals whether records exist. If it flags anything, a full query (with consent) must follow within 24 hours.
For a one-truck owner-operator, both roles are yours: you register as an employer, and because you can't oversee your own testing, you must designate a consortium/third-party administrator (C/TPA) to run your random testing program and reporting.
What "Prohibited" Status Means Now
A violation flips the driver to prohibited status: no safety-sensitive functions, full stop. The consequential change arrived with Clearinghouse-II — since November 18, 2024, state licensing agencies must downgrade the CDL of a driver in prohibited status. The violation no longer lives only in a database an employer might check; it reaches the license in your wallet.
The Way Back: Return-to-Duty
The path is defined and doable: evaluation by a DOT-qualified Substance Abuse Professional (SAP), completion of the prescribed education or treatment, a negative return-to-duty test, and then a follow-up testing plan (a minimum of six tests in the first 12 months, and it can extend up to five years). The violation record remains queryable for five years or until the follow-up plan is complete, whichever is later. Drivers who start the SAP process promptly get back to work; those who wait discover the clock never started.
Why This Belongs in Your Audit File
Clearinghouse queries are standard items in new entrant audits and compliance reviews. Keep documentation of every pre-employment full query and each annual limited query — a missing query on an otherwise clean driver is one of the most common (and most avoidable) findings.
Published July 2026. Program details summarized for education — confirm current requirements with FMCSA.
FAQ
Does refusing a drug test go into the Clearinghouse?
Yes — a refusal is reported and treated as a violation, carrying the same prohibited status as a positive test.
How long does a violation stay in the Clearinghouse?
Five years from the violation date or until the follow-up testing plan is completed, whichever is later — and it's visible to every carrier that queries during that window.
Do owner-operators really need a consortium?
Yes. You can't administer your own random testing, so FMCSA requires owner-operators to designate a C/TPA — and to register in the Clearinghouse as both employer and driver.