Drug and Alcohol Clearinghouse Basics for CDL Drivers

Every carrier that hires you for a CDL job has to check the FMCSA Drug and Alcohol Clearinghouse before you drive. If you don't have an account or don't answer the consent request, the hire can stall. Here's how it works.

This is a plain-English summary of the federal rules, not legal advice. The official sources are 49 CFR Part 382 (Subpart G covers the Clearinghouse) and FMCSA's Clearinghouse website.

What the Clearinghouse Is

The Clearinghouse is FMCSA's online database of drug and alcohol program violations by CDL and CLP holders. Violations include a positive DOT drug test, an alcohol test of 0.04 or higher, refusing a test, and actual-knowledge violations an employer reports. Medical review officers, employers and substance abuse professionals report to it. A violation follows you from carrier to carrier, so you can't hide it by switching jobs.

Who Has to Register

Employers and their service agents must register. Drivers don't have to register just to hold a CDL, but you'll need an account when a carrier wants to run a full query, because you give that consent electronically inside the Clearinghouse. You'll also need one to see your own record or start the return-to-duty process. Registering is free at clearinghouse.fmcsa.dot.gov and uses a Login.gov account. Do it before you start applying.

Pre-Employment Full Query

Under 49 CFR 382.701, a carrier must run a full query before you do any safety-sensitive work for them. A full query shows the details of any violations. You get a notice from the Clearinghouse and must log in and give consent. If you don't, the carrier can't let you drive for them. This is in addition to a pre-employment DOT drug test.

Annual Limited Query

Carriers must also query the Clearinghouse at least once a year for every CDL driver they employ. Most use a limited query, which only shows whether a record exists. You consent to limited queries on a general consent form, often signed on paper when you're hired, and it can cover more than one year. If a limited query shows something, the carrier must run a full query with your electronic consent within 24 hours, or take you off safety-sensitive work.

What a Violation Means

A driver with an unresolved violation can't do safety-sensitive work, including driving a commercial truck, until the return-to-duty process is done. Since November 2024, state licensing agencies must also check the Clearinghouse. A driver in "prohibited" status loses the commercial driving privilege on their license until they finish return-to-duty. A violation stays on record for five years from the date of the violation, or until return-to-duty and follow-up testing are complete, whichever is later.

Return-to-Duty at a High Level

1. See a substance abuse professional (SAP). You pick a qualified SAP and designate them in the Clearinghouse. They evaluate you and recommend education or treatment.
2. Finish the recommended program. The SAP checks that you did and reports when you're eligible for testing.
3. Pass a return-to-duty test. An employer runs the test under direct observation for drugs. The negative result gets reported.
4. Follow-up testing. The SAP sets a plan of unannounced tests, at least six in the first 12 months. It can last up to five years and follows you to new employers.

FMCSA's Clearinghouse Learning Center has step-by-step guides for drivers.

Habits That Keep You Hireable

• Register before you job hunt so a consent request doesn't hold up an offer.
• Answer consent requests quickly. Check your email when a carrier is onboarding you.
• Check your own record. You can look at it any time. If something is wrong, you can ask for a correction in the Clearinghouse.
• Tell your doctor you drive commercially so prescriptions are handled the right way.

Ready for Your Next Seat?

Road Ready Crew is trucker-run. We match CDL-A drivers with carriers that are straight about home time and pay. Carriers pay us. Drivers never pay. Tell us what kind of run you're looking for on our drivers page.