FMCSA Drug and Alcohol Clearinghouse: What New Carriers Must Know

The FMCSA Drug and Alcohol Clearinghouse is a secure federal database that stores records of drug and alcohol violations by commercial driver’s license (CDL) holders. It became mandatory in January 2020 and is now a required part of the driver hiring process for all motor carriers.

If you have employees who hold CDLs and perform safety-sensitive functions — or if you’re an owner-operator driving your own truck — you need to understand how this works.

What the Clearinghouse Does

Before the Clearinghouse existed, a driver could fail a drug test at one employer, resign, and get hired by another carrier without that carrier knowing about the violation. The Clearinghouse closed that gap.

It stores:

• Positive drug or alcohol test results (DOT-regulated tests)
• Refusals to take a required test
• Actual knowledge violations (employer reports a driver’s drug/alcohol use)
• Return-to-duty completion status
• Follow-up testing completion

Employers must check the Clearinghouse before hiring a CDL driver in a safety-sensitive function, and annually for current drivers.

Who Must Register

All employers of CDL drivers in safety-sensitive functions must register with the Clearinghouse. This includes:

• Motor carriers with employee CDL drivers
• Owner-operators who drive their own truck (you register as both employer and driver)
• Trucking companies of any size

There is no exemption for small carriers or single-truck operations. Registration is required.

Register at clearinghouse.fmcsa.dot.gov using your FMCSA portal login credentials.

Pre-Employment Query Requirement

Before you allow a CDL driver to perform safety-sensitive functions for the first time, you must conduct a full query of the Clearinghouse.

A full query:

• Requires the driver’s specific electronic consent through the Clearinghouse portal
• Returns the driver’s complete violation history (if any)
• Must be completed before the driver’s first safety-sensitive duty

As of January 6, 2023, a pre-employment full query of the Clearinghouse satisfies the requirement to investigate a driver’s drug and alcohol violation history from prior FMCSA-regulated employers. You no longer need to separately contact prior motor carrier employers by phone or mail to obtain their drug/alcohol test records.

Note the scope: this rule covers the drug and alcohol test history inquiry only. You are still required to contact prior employers separately to obtain safety performance history (accident history, driver complaints, and related records) as required under 49 CFR Part 391.23. The Clearinghouse does not replace that obligation.

Annual Query Requirement

For current drivers, you must conduct at least one query per year. Annual queries can be limited queries rather than full queries.

A limited query:

• Checks whether the driver has any violations in the Clearinghouse
• Does not reveal the details of any violations
• Requires general consent (which drivers typically provide at hire via a blanket consent form)

If a limited query returns a result showing violations exist, you must immediately conduct a full query (with specific driver consent) to see the details.

How Violations Are Reported

Violations are reported to the Clearinghouse by:

• Medical Review Officers (MROs): Report positive drug test results
• Breath Alcohol Technicians: Report alcohol test results above the federal threshold
• Employers: Report refusals to test and actual knowledge violations

As an employer, you have a legal obligation to report certain violations you directly observe or have actual knowledge of. Failure to report is itself a violation.

Return to Duty

A driver with a Clearinghouse violation cannot perform safety-sensitive functions until they complete the return-to-duty (RTD) process:

1. Evaluation by a Substance Abuse Professional (SAP)
2. Completion of SAP-recommended education or treatment
3. RTD drug or alcohol test (must be negative)
4. Follow-up testing program as directed by the SAP

Only after RTD is complete and recorded in the Clearinghouse may the driver return to safety-sensitive duties. The employer must verify RTD completion in the Clearinghouse — not just take the driver’s word for it.

Clearinghouse-II: CDL Downgrade for Prohibited Drivers

Effective November 18, 2024, FMCSA implemented Clearinghouse-II. Under this rule, state driver licensing agencies (SDLAs) are required to downgrade the CDL or CLP of any driver who is in a “prohibited” status in the Clearinghouse — meaning they have an unresolved drug or alcohol violation and have not completed the return-to-duty process.

What this means practically:

• A driver with an unresolved Clearinghouse violation will have their CDL downgraded to a non-CDL license by their state
• The downgrade happens automatically once the SDLA receives the prohibited status from the Clearinghouse
• The driver cannot legally operate a CMV requiring a CDL until their RTD process is complete and the Clearinghouse status is updated
• The CDL is reinstated after RTD completion is recorded in the Clearinghouse

This change closes a gap where drivers with Clearinghouse violations could still technically hold a valid CDL. As an employer, verify Clearinghouse status — not just license class — before allowing a driver to operate.

Record Retention

Keep documentation of all Clearinghouse queries and results as part of your driver qualification files. Clearinghouse records should be retained for the duration of the driver’s employment plus 3 years.

See Driver Qualification File Checklist for how Clearinghouse documentation fits into the complete DQ file requirement.

Frequently Asked Questions

Do I need to register for the Clearinghouse as a solo owner-operator?

Yes. All employers of CDL drivers in safety-sensitive functions must register with the Clearinghouse, including owner-operators who are their own only driver. You register as both the employer and the driver.

What is a 'limited query' vs. a 'full query'?

A limited query checks whether any violation records exist for a driver but doesn't reveal the details. It requires the driver's consent but not a specific release. A full query reveals the actual violation records and requires the driver's specific electronic consent in the Clearinghouse. Pre-employment queries must be full queries. Annual queries can be limited.

What happens if I hire a driver who has a Clearinghouse violation?

A driver with an unresolved violation is prohibited from performing safety-sensitive functions. You cannot allow them to drive until the return-to-duty process is complete and the violation is marked resolved in the Clearinghouse. Allowing a driver with an active violation to operate is a federal violation.