FMCSA Clearinghouse Guide: Registration, Queries, and Compliance for 2026

The FMCSA Drug & Alcohol Clearinghouse is a secure online database that tracks drug and alcohol violations for commercial motor vehicle drivers. Since its launch in January 2020, it has fundamentally changed how carriers screen drivers — replacing the old system where a driver with a positive drug test at one company could simply move to another carrier without disclosure.

As of 2026, the Clearinghouse is fully integrated into the hiring and annual compliance process for every motor carrier operating CMVs requiring a CDL. In this guide, you will learn:

• What the Clearinghouse is and what violations it tracks
• Who must register (employers, drivers, medical review officers, and others)
• The difference between limited and full queries
• When queries are required and how to run them
• Costs and consent requirements
• What to do if a driver has a Clearinghouse violation
• The return-to-duty process

What the Clearinghouse Is

The FMCSA Drug & Alcohol Clearinghouse is a federal database maintained under 49 CFR Part 382, Subpart G. It serves as a centralized repository for records of drug and alcohol program violations by CDL holders and CDL permit holders. Before the Clearinghouse existed, carriers relied on contacting previous employers individually to learn about a driver's testing history — a slow, unreliable process where information frequently fell through the cracks.

The Clearinghouse records the following types of violations:

• Positive drug test results (including adulterated or substituted specimens)
• Positive alcohol test results (BAC of 0.04 or higher)
• Refusal to test (failure to appear, failure to provide specimen, tampering)
• Actual knowledge violations determined by the employer (use of drugs or alcohol on duty, prior to duty, or following an accident)
• Return-to-duty (RTD) test results
• Follow-up test results (completion of follow-up testing plan)

Who Must Register

Registration requirements depend on your role in the commercial motor vehicle industry:

Registration is free for all users. Employers register at the FMCSA Clearinghouse website using their USDOT number. Drivers register using their CDL information and must verify their identity through login.gov.

Limited Queries vs. Full Queries

The Clearinghouse offers two types of queries, and understanding the difference is critical for compliance:

Limited Query

A limited query tells the employer whether the Clearinghouse contains any information about the driver — a simple yes or no answer. It does not reveal the details of any violations.

• Cost: $1.25 per query
• Consent: General consent (can be obtained once and remains valid until the driver revokes it)
• When used: Annual queries for current employees
• Result: Either "no information exists" or "information exists — full query required"

Full Query

A full query returns the complete details of any violations in the driver's Clearinghouse record, including the type of violation, the date, the substance involved, and the status of any return-to-duty process.

• Cost: $1.25 per query
• Consent: Specific electronic consent required for each full query (driver must log in to the Clearinghouse and grant consent)
• When used: Pre-employment queries and follow-up when a limited query returns a result
• Result: Full details of all violations on record

The key distinction is consent. A limited query requires only general consent, which can be a blanket authorization signed at the time of hire. A full query requires the driver to electronically consent through the Clearinghouse system each time. If a driver refuses to provide consent for a full query, the employer must not allow them to perform safety-sensitive functions — the refusal is treated the same as a positive result for employment purposes.

When Queries Are Required

FMCSA mandates Clearinghouse queries at specific points in the employment lifecycle:

Note that the annual limited query replaces the previous employer verification process for drug and alcohol testing history. As of January 6, 2023, employers are no longer required to request drug and alcohol testing records from a driver's previous employers — the Clearinghouse query satisfies this requirement.

How to Run a Clearinghouse Query

Both query types are conducted through the FMCSA Clearinghouse website. For a limited query, log in as an employer, enter the driver's CDL information, confirm general consent is on file, and submit. Results are returned immediately. For a full query, the process is the same except the driver must separately log in to the Clearinghouse and electronically grant consent before results are released. Both query types cost $1.25 each, billed to the employer's Clearinghouse account. Employers can purchase query plans in bulk for carriers running large numbers of annual queries.

What Happens When a Violation Is Found

If a Clearinghouse query returns a violation, the employer's obligations depend on the status of the violation:

Unresolved Violation (No Return-to-Duty Completed)

The driver cannot perform any safety-sensitive function, including operating a CMV. The employer must:

1. Immediately remove the driver from safety-sensitive duties
2. Provide the driver with a list of Substance Abuse Professionals (SAPs)
3. Inform the driver of the return-to-duty process

The employer is not required to terminate the driver. They may keep the driver employed in a non-safety-sensitive capacity while the driver completes the return-to-duty process. However, the driver cannot drive a CMV until the process is complete.

Resolved Violation (Return-to-Duty Completed)

If the violation record shows that the driver has completed the return-to-duty process — including SAP evaluation, negative return-to-duty test, and follow-up testing plan — the employer may consider the driver for employment. The violation remains on the Clearinghouse record for 5 years, but the resolved status indicates the driver has fulfilled all requirements.

The Return-to-Duty Process

A driver with a Clearinghouse violation must complete several steps before returning to safety-sensitive duties:

1. SAP evaluation — the driver must be evaluated by a DOT-qualified Substance Abuse Professional who determines the appropriate treatment or education program
2. Complete treatment — the driver completes whatever program the SAP prescribes (education, counseling, treatment)
3. Follow-up SAP evaluation — the SAP conducts a second evaluation to determine if the driver has complied with the treatment recommendations
4. Return-to-duty test — the driver must pass a directly observed drug and/or alcohol test (depending on the original violation type)
5. Follow-up testing plan — the SAP establishes a follow-up testing plan of at least 6 directly observed tests in the first 12 months, with possible extension up to 60 months total

Each step is reported to the Clearinghouse by the SAP or the employer. The violation record is updated to reflect the driver's progress. The driver cannot return to safety-sensitive duties until the return-to-duty test comes back negative.

Driver Consent Requirements

Consent is a critical part of the Clearinghouse process, and there are specific rules about how consent must be obtained and documented:

• General consent for limited queries — can be obtained in writing (paper or electronic) and remains valid until the driver revokes it. Most carriers include this in their onboarding paperwork.
• Specific electronic consent for full queries — must be granted by the driver through the Clearinghouse system. Cannot be obtained on paper. The driver must log in and click "Grant" for each full query.
• Refusal to consent — if a driver refuses to grant consent for a required query, the employer must not allow them to perform safety-sensitive functions. For pre-employment queries, this effectively means the driver cannot be hired for a driving position.

Clearinghouse and State CDL Agencies

Beginning November 18, 2024, state driver licensing agencies (SDLAs) are required to query the Clearinghouse before issuing, renewing, upgrading, or transferring a CDL. This means that a driver with an unresolved Clearinghouse violation will be unable to maintain their CDL — the state will either deny renewal or downgrade the license.

This change closed a significant loophole. Previously, a driver could have a Clearinghouse violation but maintain a valid CDL if no employer ran a query. Now, the state licensing process itself serves as an additional check.

Costs and Budgeting

The costs for using the Clearinghouse are straightforward:

For a fleet of 50 drivers, the annual cost for limited queries is approximately $62.50. Even with pre-employment full queries for new hires, the Clearinghouse is one of the least expensive compliance requirements carriers face.

Common Compliance Mistakes

Despite the straightforward process, carriers frequently make these errors:

• Missing the annual query deadline — every driver must have a query conducted at least once every 12 months. Missing a single driver creates a compliance gap that auditors will catch.
• Using a limited query for pre-employment — pre-employment queries must be full queries, not limited. A limited query at the pre-employment stage does not satisfy §382.701(a).
• Not following up on limited query results — when a limited query returns "information exists," the carrier must promptly run a full query. Some carriers delay or forget this follow-up step.
• Not documenting general consent — while general consent can be a simple signed form, it must actually exist in the file. Auditors check for it.
• Allowing a driver to work while awaiting full query consent — if a full query is required and the driver has not yet granted consent, the driver should not be performing safety-sensitive functions until the query is complete and the results are clear.

Frequently Asked Questions

How long do violations stay in the Clearinghouse?

Violations remain in the Clearinghouse for 5 years from the date of the violation. If the driver completes the return-to-duty process, the record is updated to show the resolved status, but the violation itself remains visible for the full 5-year period.

Can a driver check their own Clearinghouse record?

Yes. Drivers can log in to the Clearinghouse at any time to view their own record at no charge. This is recommended before job interviews so the driver knows what a prospective employer will see.

Does the Clearinghouse replace the pre-employment drug test?

No. The Clearinghouse query is a separate requirement from the pre-employment drug test. Both must be completed before a driver can operate a CMV. The Clearinghouse checks for previous violations; the pre-employment drug test checks the driver's current status.

What if a driver has a violation from a previous employer?

If the violation is unresolved, the driver cannot be placed in a safety-sensitive position. If the violation is resolved (return-to-duty completed), the carrier can consider the driver for employment but should review the details of the violation and the driver's compliance with follow-up testing.

Bottom Line

The FMCSA Clearinghouse has made drug and alcohol violation tracking transparent and unavoidable. Carriers that stay on top of their query obligations — full queries at pre-employment, limited queries annually, and prompt follow-up when results are found — protect themselves from hiring drivers with unresolved violations and maintain clean audit records. FleetCollect integrates Clearinghouse query tracking into its driver qualification file system, so you can manage pre-employment and annual queries alongside every other compliance document in one place.