49 CFR 382: DOT Drug and Alcohol Testing

Regulatory citation: 49 CFR Part 382, Controlled Substances and Alcohol Use and Testing (Federal Motor Carrier Safety Administration), applied with the DOT testing procedures in 49 CFR Part 40

What Is the FMCSA Drug and Alcohol Testing Rule?

Part 382 sets the drug and alcohol testing program for drivers who need a commercial driver's license (CDL) or commercial learner's permit (CLP) to operate a commercial motor vehicle. It applies to every employer of those drivers, including interstate and intrastate carriers, federal, state and local government employers, churches and other non-profits, and owner-operators. An owner-operator who employs only themselves must still join a consortium or third-party administrator (C/TPA) for random testing.

Part 382 says who must be tested, when and how often, what conduct is prohibited, and what happens after a violation. Part 40 sets how the tests are done, covering specimen collection, laboratory analysis, the medical review officer (MRO), breath alcohol technicians and the substance abuse professional (SAP). The two parts work together, so a compliant program has to meet both.

The rule only covers safety-sensitive functions. That means all time from when a driver begins work or is required to be ready to work until they are relieved from work, including driving, waiting to be dispatched, inspecting or servicing the vehicle, loading and unloading, and attending a disabled vehicle.

Why Drug and Alcohol Testing Matters

A single impaired driver in an 80,000-pound truck or a loaded school bus can cause a multi-fatality crash. Testing deters use, finds drivers who need help, and keeps them out of the cab until they have completed a return-to-duty process. Testing violations are also a common finding in FMCSA compliance investigations, and gaps such as missing random tests or skipped Clearinghouse queries can contribute to an unsatisfactory safety rating.

Core Obligations

1. Know the Prohibited Conduct (382.201 to 382.215)

A driver may not report for duty or remain on duty for safety-sensitive functions with an alcohol concentration of 0.04 or greater, use alcohol while performing safety-sensitive functions, use alcohol within four hours before performing them, or possess alcohol while on duty unless it is manifested cargo. A driver may not use any Schedule I controlled substance, or other controlled substances unless prescribed by a licensed practitioner who has advised that the substance will not affect safe driving. Refusing a required test is a violation in its own right. A driver who tests between 0.02 and 0.039 is not in violation, but must be removed from safety-sensitive functions for at least 24 hours.

2. Put a Written Policy in Place (382.601)

Before testing starts, each driver must receive educational materials explaining the requirements, the employer's policy, the name of the person designated to answer questions, the consequences of a violation and information on the effects of alcohol and drug use. Each driver must sign a statement certifying receipt, and the employer keeps the original signed statement. Supervisors who may make reasonable suspicion decisions need at least 60 minutes of training on alcohol misuse and 60 minutes on controlled substances use (382.603).

3. Run Pre-Employment Tests and Queries (382.301 and 382.701)

A driver may not perform safety-sensitive functions for the first time until the employer receives a verified negative drug test result. Pre-employment alcohol testing is optional. Before hiring, the employer must also run a full query of the FMCSA Drug and Alcohol Clearinghouse, which needs the driver's specific electronic consent in the Clearinghouse. For drivers who previously worked for employers regulated by other DOT agencies, such as the FAA or FTA, the employer still has to ask those employers for drug and alcohol history under Part 40.

4. Conduct Random Testing at the Required Rates (382.305)

For 2026, the FMCSA minimum annual rates are 50 percent of the average number of driver positions for drugs and 10 percent for alcohol. Selections must use a scientifically valid method, such as a random number table or computer program, so that every driver has an equal chance of selection each time. Tests must be unannounced and spread reasonably throughout the calendar year. Once notified, a driver must go to the collection site immediately. Random alcohol tests may only be performed just before, during or just after the driver performs safety-sensitive functions.

5. Test After Qualifying Accidents (382.303)

Post-accident tests are required after any accident involving a fatality. They are also required when the driver receives a citation for a moving traffic violation and the accident involved either bodily injury treated away from the scene or a vehicle towed away with disabling damage. Alcohol tests should be done within 2 hours and must not be attempted after 8 hours. Drug tests must be done within 32 hours. If a test is not completed in time, the employer must prepare and keep a record stating why.

6. Test on Reasonable Suspicion (382.307)

A reasonable suspicion test is required when a trained supervisor or company official observes specific, contemporaneous and articulable signs of drug or alcohol use, such as appearance, behavior, speech or body odor. A written record of the observations must be made within 24 hours or before the test results are released, whichever is earlier. The same 2-hour and 8-hour alcohol time limits apply.

7. Manage Return-to-Duty and Follow-Up Testing (382.309 and 382.311)

A driver who violates the rule must be removed from safety-sensitive functions immediately and given a list of SAPs. Before returning, the driver must complete the SAP's evaluation and recommended education or treatment, then pass a directly observed return-to-duty test. The SAP sets follow-up testing of at least six unannounced, directly observed tests in the first 12 months, and follow-up can continue for up to 60 months. The employer is not required to rehire the driver, but any employer that does must follow the SAP's plan.

8. Report to and Query the Clearinghouse (382.701 to 382.705)

Employers must query the Clearinghouse at least once a year for every CDL driver they employ. A limited query, which needs only the driver's general written consent, satisfies the annual requirement. If it shows information exists, the employer must run a full query within 24 hours or remove the driver from safety-sensitive functions. Employers must report alcohol results of 0.04 or above, refusals, actual knowledge violations and negative return-to-duty results by the close of the third business day after learning of them. MROs report verified positive drug results. Since November 18, 2024, state driver licensing agencies must check the Clearinghouse and downgrade the CDL or CLP of any driver in prohibited status.

9. Keep Records for the Required Periods (382.401)

Records of positive drug results, alcohol results of 0.02 or greater, refusals, SAP evaluations and annual summaries must be kept for 5 years. Records related to the collection process must be kept for 2 years, and negative drug results and alcohol results below 0.02 for 1 year. Supervisor training records are kept for as long as the supervisor performs those duties plus 2 years. Records must be kept in a secure location with controlled access.

Common Compliance Approaches

Use a Reputable C/TPA

Most small and mid-sized carriers use a consortium or third-party administrator to manage random pools, schedule collections and track rates. The employer stays legally responsible, so ask for quarterly selection lists and year-end rate reports and keep them on file.

Keep the Random Pool Accurate

Add drivers to the pool on their first day and remove them only when they leave. Carriers that forget to enroll new hires, or that test the same few drivers repeatedly, often fall short of the 50 percent rate without realizing it.

Build a Post-Accident Decision Card

Give dispatchers and drivers a one-page flowchart covering fatality, injury, tow-away and citation criteria, with the 2-hour, 8-hour and 32-hour clocks. Most post-accident failures come from confusion in the first hours after a crash.

Calendar Every Annual Query

Track the date of each driver's last Clearinghouse query and run the next one before 12 months have passed. Buy query plans in advance so an empty account does not delay a hire.

Example: Drug and Alcohol Testing in Practice

A regional flatbed carrier with 40 CDL drivers joins a consortium, which places its drivers in a combined pool and selects names each quarter. In March, a driver is selected for a random drug test while loading steel. The dispatcher tells him in person and he goes straight to the collection site. The MRO later verifies a positive result for amphetamine and reports it to the Clearinghouse. The carrier removes the driver from driving that day and gives him a list of SAPs. Eight weeks later he completes treatment, passes a directly observed return-to-duty test and returns to work with a SAP plan requiring eight follow-up tests over the next 18 months. The safety manager logs each follow-up test separately from the random program and runs a fresh limited query on all drivers in the fourth quarter to keep annual queries current.

Related regulations: DOT driver qualification files, DOT hours of service, OSHA access to exposure and medical records.

Note: This summary covers FMCSA requirements for CDL drivers. Other DOT agencies, including the FAA, FRA, FTA, PHMSA and the Coast Guard, have their own testing rules and rates. DOT proposed adding fentanyl and norfentanyl to the Part 40 drug panel in September 2025, but no final rule had been issued as of October 2026. Oral fluid testing is authorized but cannot be used until HHS certifies at least two laboratories, and since June 10, 2026 directly observed collections are done as urine tests. Always check the current regulation text and ODAPC guidance.

Frequently Asked Questions

Do non-CDL drivers need DOT drug testing?

Not under Part 382. The rule applies only to drivers who need a CDL or CLP. Non-CDL drivers of smaller commercial vehicles still have to meet the driver qualification rules in Part 391, and employers may test them under a separate company policy that is clearly kept apart from DOT testing.

What are the FMCSA random testing rates for 2026?

The minimum rates are 50 percent for drugs and 10 percent for alcohol, based on the average number of driver positions in the pool during the year. The rates last changed in 2020.

Does a limited query satisfy the annual Clearinghouse requirement?

Yes. A limited query with the driver's general consent meets the annual requirement. If it shows that information exists, a full query must be completed within 24 hours or the driver must be removed from safety-sensitive functions.

Can a driver use marijuana where it is legal under state law?

No. DOT rules do not allow marijuana use by safety-sensitive employees, including medical use under state law, and an MRO will not verify a positive marijuana result as negative because of a state authorization.

How long does a violation stay in the Clearinghouse?

A violation stays for 5 years from the date of the violation, or until the driver completes the return-to-duty process and all follow-up testing, whichever is later.