DOT Drug and Alcohol Testing Rules
DOT drug and alcohol testing rules (49 CFR Part 382) cover drivers who must hold a CDL, with six kinds of tests. The 2026 minimum random rates are 50% for drugs and 10% for alcohol. Drivers who do not need a CDL are not covered by Part 382. Owner-operators must join a random testing consortium, because a solo driver cannot run a random pool alone.
Facts checked October 15, 2026
Key Points
- Part 382 covers drivers who must hold a CDL (49 CFR 382.103). Drivers of trucks that do not need a CDL are not covered
- There are six kinds of DOT tests. They are listed in the table below. Refusing a test is also a violation
- The 2026 minimum random rates are 50% for drugs and 10% for alcohol. They have not changed since 2020 (DOT)
- A driver cannot do safety-sensitive work at an alcohol level of 0.04 or more. Nor within 4 hours after using alcohol (49 CFR 382.201 and 382.207)
- An employer who is the only driver still needs a random pool of two or more drivers. So owner-operators join a consortium (49 CFR 382.103(b))
- Employers must check the Clearinghouse before they hire a driver. They must check it again at least once a year (49 CFR 382.701)
- DOT still tests for marijuana. DOT says its testing rules and marijuana guidance have not changed (notice updated December 19, 2025)
The six kinds of DOT drug and alcohol tests
| When it happens | Key rule | |
|---|---|---|
| Pre-employment | Before a driver first does safety-sensitive work for an employer | A drug test with a verified negative result first (49 CFR 382.301) |
| Random | Unannounced, spread through the year | Minimum yearly rates of 50% for drugs and 10% for alcohol (49 CFR 382.305) |
| Post-accident | After a qualifying crash | Alcohol within 2 hours if possible and never after 8 hours; drugs within 32 hours (49 CFR 382.303) |
| Reasonable suspicion | A trained supervisor sees signs of misuse | Based on specific, contemporaneous, articulable observations. Supervisors get 60 minutes of training on alcohol and 60 more on drugs (49 CFR 382.307, 382.603) |
| Return-to-duty | After a violation, with a substance abuse professional (SAP) | Follows the Part 40 process before the driver returns to safety-sensitive work |
| Follow-up | After the driver returns to duty | At least six unannounced tests in the first 12 months. The SAP can require more over the next 48 months (49 CFR 40.307) |
Who has to follow DOT drug and alcohol testing rules?
Part 382 applies to drivers who must hold a CDL under 49 CFR Part 383, and to their employers (49 CFR 382.103). A truck that does not need a CDL, such as a straight truck rated 26,000 pounds or less, is not covered. A company can still test those drivers under its own policy, but that is not a DOT test. The testing covers safety-sensitive work. That is all the time you are working or ready to work. It includes waiting at a shipper or employer facility to be dispatched, inspecting the truck, and driving (49 CFR 382.107).
When does a CDL driver have to be tested?
The table above lists the six kinds of tests. A post-accident test is required after any crash with a human fatality. It is also required when the driver gets a traffic citation and either someone is hurt and treated away from the scene or a vehicle has to be towed (49 CFR 382.303). A reasonable suspicion test needs a trained supervisor to act on specific, contemporaneous, articulable observations, not a hunch (49 CFR 382.307). Refusing any required test is itself a violation (49 CFR 382.211).
How do random drug and alcohol tests work?
FMCSA sets the minimum yearly random rates as a percent of the average number of driver positions. For drugs it is 50 percent (49 CFR 382.305). For alcohol it is 10 percent, and FMCSA can raise or lower it based on industry violation data. It publishes a notice only when it changes the rate. DOT's 2026 rates page says the rates did not change for 2026 and last changed in 2020. The selection must use a scientifically valid method. Each driver must have an equal chance of being picked each time, and each driver picked must be tested during the selection period. So a driver can be picked more than once in a year, or not at all. Example: a pool that averages 8 drivers needs about 4 random drug tests a year (8 x 50%) and about 1 random alcohol test (8 x 10% = 0.8). That is an estimate to show the math, not a schedule.
What do owner-operators have to do?
An employer who is the only driver must follow both the employer rules and the driver rules in Part 382. They must also run a random program with two or more covered employees in the pool (49 CFR 382.103(b)). A solo driver cannot do that alone. So owner-operators join a consortium, also called a C/TPA. It pools drivers from several employers. It handles the random selection, the scheduling and the lab reporting. If you are leased to a carrier, ask whether the carrier puts you in its random pool, so you are not enrolled twice.
What drugs does a DOT drug test check for?
A DOT test is a 5-panel test at an HHS-certified lab. It looks for marijuana (THC), cocaine, amphetamines, opioids and PCP. DOT confirms 14 drugs in all. The opioids include codeine, morphine, heroin, hydrocodone, hydromorphone, oxycodone and oxymorphone. Marijuana is still tested. In its December 2025 notice, DOT said the executive order on rescheduling does not change its drug testing process or rules. It also said its guidance on medical and recreational marijuana still applies. Check DOT's marijuana notice for updates.
What are the DOT alcohol rules?
A driver may not report for duty, or stay on duty, at an alcohol level of 0.04 or more (49 CFR 382.201). A driver may not do safety-sensitive work within 4 hours after using alcohol (49 CFR 382.207). If a test shows 0.02 or more but less than 0.04, the driver must stay off safety-sensitive work until the next regular duty period, and for at least 24 hours after the test (49 CFR 382.505). Below 0.04, the employer cannot act under Part 382 based only on the result. A result of 0.04 or more is a violation with the consequences below.
What is the Drug and Alcohol Clearinghouse?
The Clearinghouse is FMCSA's database of drug and alcohol violations by CDL and CLP holders. Before an employer lets a driver do safety-sensitive work, it must run a full pre-employment query, and the driver must give specific consent (49 CFR 382.701). The employer must also query at least once a year for every driver it employs who is subject to testing. For the yearly check, a limited query with the driver's consent can be used. If it shows information exists, the employer must run a full query within 24 hours.
What happens after a positive test or a refusal?
A driver who breaks a Part 382 prohibition, including by refusing a required test, may not do safety-sensitive work or drive a commercial motor vehicle. The employer may not let the driver (49 CFR 382.501). The way back is the Part 40 process. First the driver sees a substance abuse professional (SAP). Then the driver does any treatment or education the SAP recommends and takes a return-to-duty test. After that come follow-up tests. The SAP must set at least six unannounced follow-up tests in the first 12 months back on duty. The SAP can also require tests over the next 48 months (49 CFR 40.307). The violation is recorded in the Clearinghouse.
Related Free Tools
Accident Documentation Kit
A step-by-step form for documenting an accident right away. Time is critical.
DOT Audit Readiness Checklist
An interactive compliance checklist to get ready for a DOT compliance review.
Drug & Alcohol Testing Tracker
Track DOT-required random testing compliance. FMCSA minimums: 50% drug, 10% alcohol.
CDL & Compliance Deadline Tracker
Track all compliance deadlines in one place with color-coded alerts.
Frequently Asked Questions
Do non-CDL drivers need DOT drug tests?+
Not under Part 382. The rule applies to drivers who are required to hold a CDL (49 CFR 382.103). A driver of a truck that does not need a CDL, such as a straight truck rated 26,000 pounds or less, is outside the FMCSA program. Your company policy or a customer contract may still require testing, but that is not a DOT test.
Can I run my own random drug testing program as an owner-operator?+
No. An employer who is the only driver still needs a random pool of two or more covered employees (49 CFR 382.103(b)). A solo driver cannot do that alone. So owner-operators join a consortium, also called a C/TPA. It pools drivers from several employers and handles selection, scheduling and lab reporting.
How often will I be randomly tested?+
There is no fixed schedule. The rule says every driver in the pool must have an equal chance of being picked each time selections are made, and every driver picked must be tested (49 CFR 382.305). So a driver can be picked more than once a year, or not at all. The yearly rates apply to the whole pool, not to one driver.
What are the DOT random testing rates for 2026?+
They are 50% of average driver positions for drugs and 10% for alcohol. DOT's 2026 random testing rates page says the rates did not change for 2026 and last changed in 2020. FMCSA publishes a notice only when it changes them.
Does DOT still test for marijuana?+
Yes. Marijuana is one of the five drug groups in a DOT test. After the December 2025 executive order on rescheduling, DOT said its drug testing process and rules will not change. It also said its guidance on medical and recreational marijuana and CBD still applies. Check DOT's marijuana notice for updates.
How soon after an accident does a driver have to be tested?+
An alcohol test should be given within 2 hours. If it is not, the employer must write down why, and it must stop trying after 8 hours. A drug test should be given within 32 hours (49 CFR 382.303). The driver must stay available for testing, or the employer can treat it as a refusal (49 CFR 382.303(e)).
What alcohol level takes a driver off duty?+
At 0.04 or more, the driver may not do safety-sensitive work and has a violation (49 CFR 382.201). At 0.02 to 0.039, the driver is off safety-sensitive work until the next regular duty period, and for at least 24 hours after the test (49 CFR 382.505). A driver also may not work within 4 hours after using alcohol (49 CFR 382.207).
More federal trucking rules
- Hours of Service Rules for Truck Drivers
- ELD Mandate: Who Needs an ELD
- DOT Roadside Inspection Levels Explained
- Driver Qualification File Requirements
- DVIR and Vehicle Maintenance Rules
- New Entrant Safety Audit Requirements
- Hours of Service Exceptions and Exemptions
- Motor Carrier Insurance Requirements
- CDL Classes, Endorsements and ELDT Training
- DOT Physical and Medical Card Requirements
- Drug and Alcohol Clearinghouse Requirements
- Cargo Securement Rules for Trucks
- Hazmat Basics for Truck Drivers and Carriers
- USDOT Number and Biennial Update Requirements
- Safety Ratings, Compliance Reviews and DataQs
- Federal Truck Size and Weight Limits
- California Clean Truck Check (HD I/M)
- Truth-in-Leasing Rules for Owner-Operators
- Form 2290 Heavy Highway Vehicle Use Tax
- Truck Driver Phone, Texting and Seat Belt Rules
- Railroad Crossing Rules for Truck Drivers
- Truck Emergency Equipment and Warning Triangle Rules
- Truck Windshield, Dash Cam and Mirror Rules
- CDL Disqualification: Major and Serious Offenses
- Truck Tire Rules: Tread Depth, Retreads and Pressure
- Trailer Reflective Tape (Conspicuity) Rules
- Truck Brake Rules: Pushrod Stroke, Lining Thickness and ABS
- Driver Conduct Rules: Alcohol, Drugs, Fatigue, Passengers and Pre-Trip Checks
- English Language Proficiency for Truck Drivers: The 391.11(b)(2) Rule
- Weigh Station Rules: Who Must Stop and What Happens If You Skip
- Truck Lighting Rules: Required Lamps and Reflectors (49 CFR 393)
- Driver Road Test Rules: The Company Road Test and Certificate (49 CFR 391.31)
- Box Truck and Hotshot Requirements: CDL, USDOT Number, Authority and ELD
- Owner-Operator Requirements: What You Need Before You Haul
Related terms and pages
Sources
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This is a plain-language summary for reference, not legal advice. Check the official rule text before you rely on any detail. Ask a compliance professional about your own operation.