DOT Reasonable Suspicion Training for Supervisors
If your company has CDL drivers, someone has to be able to spot a driver who is drunk or high and send them for a test. The FMCSA calls this reasonable suspicion testing, and only a supervisor with reasonable suspicion training can make that call. Without a trained supervisor, you have no legal way to send a driver for a reasonable suspicion test.
This guide covers who needs DOT supervisor training, what it covers, where to get it, and what to do when you think a driver is impaired.
Under 49 CFR 382.603, anyone who supervises CDL drivers needs 60 minutes of training on alcohol misuse and 60 minutes on drug use before they can send a driver for a reasonable suspicion test. It's a one-time training with no refresher required. Solo owner-operators don't need it. Once you hire a driver, whoever supervises them does.
What is reasonable suspicion training?
Reasonable suspicion training teaches supervisors how to tell when a driver may be under the influence of alcohol or drugs. The rule is 49 CFR 382.603. It requires at least 60 minutes on alcohol and another 60 minutes on drugs, for 2 hours total.
The training has to cover four kinds of warning signs: physical, behavioral, speech, and performance. When a supervisor sees something wrong, they know what to look for, what to write down, and when they have enough to send the driver for a test.
| Rule | What it says |
|---|---|
| Alcohol training | 60 minutes |
| Drug training | 60 minutes |
| Refresher training | Not required |
| Alcohol test after the call | Within 2 hours. Stop trying after 8. |
| Signed written record | Within 24 hours, or before results come back |
| Keep training records | While they supervise, plus 2 years |
| Keep reasonable suspicion records | 2 years |
Who needs DOT supervisor training?
Anyone your company names to supervise CDL drivers needs it. That can be the owner, a fleet manager, a safety manager, or a dispatcher who works with drivers every day. If one of these people might be the one to pull a driver off the road, they need the training first.
According to the FMCSA, if you run vehicles that need a CDL on public roads and you have more than one employee, you need DOT supervisor training. That applies to interstate and intrastate carriers.
If your trained supervisor leaves, the person who replaces them has to take it before they can make a reasonable suspicion call.
Do owner-operators need supervisor training?
No, not if you're the only driver. The FMCSA says owner-operators are not subject to DOT supervisor training, because there's no one for you to supervise. You still need to be in a drug and alcohol consortium for your own testing.
That changes the day you hire your first driver. Now you're a supervisor. You, or whoever manages that driver, needs reasonable suspicion training before you can send them for a test.
How long is the training, and does it expire?
The training takes about 2 hours: 60 minutes on alcohol and 60 minutes on drugs. You can split it up if the course is self-paced.
It doesn't expire. The rule says refresher training is not required. Some carriers retrain their supervisors every few years anyway, so the warning signs stay fresh.
Where do you get reasonable suspicion training?
The FMCSA doesn't offer a course. The rule only says what the training has to cover and how long it has to be. It's up to you to get it done.
That leaves two choices. You can build your own course that covers the full 60 minutes on alcohol and 60 minutes on drugs, with all four kinds of warning signs. Or you can buy a course that already does. For most small fleets, buying one is the only practical option.
Our DOT supervisor training is $145 per supervisor. It's online and self-paced, covers both 60-minute sections, and ends with a printable certificate for your records.
What signs does the training teach you to spot?
The rule says your reason for testing has to be based on what you see, hear, or smell yourself, right then. The FMCSA's term is "specific, contemporaneous, articulable observations." In plain words, you need clear details you saw that day and can explain in writing. A hunch or a rumor isn't enough.
The training covers signs like these:
- Appearance. Bloodshot eyes, very large or very small pupils, a flushed face, or messy clothes and hygiene that aren't normal for that driver.
- Behavior. Stumbling, shaking hands, falling asleep, being unusually angry or jumpy, or acting confused.
- Speech. Slurred words, talking too fast or too slow, or not making sense.
- Body odor. The smell of alcohol or marijuana on the driver's breath or clothes.
For drugs, the signs can also include withdrawal effects, like sweating, chills, or a runny nose. Marijuana being legal in your state doesn't matter here. It is still banned for CDL drivers under DOT rules.
What do you do if you think a driver is impaired?
Here's what 49 CFR 382.307 requires, in order.
- Write down what you see. Note the date, the time, and each sign you saw, heard, or smelled. Be specific.
- Take the driver off duty. Don't let them drive or do any safety-sensitive work. Don't let them drive themselves to the test site either.
- Set up the test. Call your consortium or C/TPA to schedule a reasonable suspicion test. If you're in the TIPS consortium, call us at (208) 278-6722 and we'll set it up.
- Get the alcohol test done fast. It should happen within 2 hours. If it can't, write down why. After 8 hours, stop trying and write down why it didn't happen. The supervisor who made the call can't be the one who gives the alcohol test.
- Sign the written record. The supervisor who saw the signs signs a written record of them within 24 hours, or before the test results come back, whichever comes first.
- Keep the paperwork. Keep your reasonable suspicion records for 2 years.
If the alcohol test never happens, the driver stays off safety-sensitive work for 24 hours. You also can't punish a driver under these rules based only on how they looked or acted, without an alcohol test.
What happens if the test comes back positive?
The driver comes off safety-sensitive work right away. A positive result or a refusal gets reported to the Drug and Alcohol Clearinghouse, which is why every CDL employer needs a Clearinghouse employer account. Before they can drive again, the driver has to finish the return-to-duty process with a substance abuse professional. Our DOT drug and alcohol testing guide walks through that process.
What if you don't have a trained supervisor?
Then no one at your company can make a reasonable suspicion call. If a driver shows up drunk or high, you can still keep them off the road, but you have no legal way to send them for a DOT test based on what you saw.
It also shows up in audits. Auditors ask for proof that your supervisors are trained. Keep each supervisor's certificate with your drug and alcohol program records for as long as they supervise drivers, plus 2 years after they stop. Our new entrant safety audit guide covers what else the auditor will ask for.
Frequently asked questions
Is reasonable suspicion training required?+
Yes, for anyone who supervises CDL drivers. 49 CFR 382.603 requires at least 60 minutes of training on alcohol and 60 minutes on drugs before a supervisor can send a driver for a reasonable suspicion test.
Do owner-operators need DOT supervisor training?+
Not if they're the only driver. The FMCSA says solo owner-operators are not subject to supervisor training. Once you hire a driver, whoever supervises that driver needs the training.
Does reasonable suspicion training expire?+
No. The rule says refresher training is not required. A new supervisor does need the training before they can make a reasonable suspicion call, even if the person they replaced was trained.
Can I take supervisor training online?+
Yes. The rule sets the length and the topics. It doesn't say the training has to be in person. An online course works as long as it covers 60 minutes on alcohol and 60 minutes on drugs, including physical, behavioral, speech, and performance signs. Our online supervisor training is $145 per supervisor.
Can the supervisor who spots the signs give the alcohol test?+
No. The person who decides there's reasonable suspicion can't be the one who gives the alcohol test. Call your consortium or C/TPA to schedule the test with a collector.
How long do I keep reasonable suspicion records?+
Keep the records behind a reasonable suspicion test for 2 years. Keep each supervisor's training certificate for as long as they supervise drivers, plus 2 years after they stop.
Get your supervisors trained for $145 each.
Our online course covers the 60 minutes on alcohol and 60 minutes on drugs that 49 CFR 382.603 requires. It's self-paced, and it ends with a printable certificate for your drug and alcohol records.
Questions first? Call (208) 278-6722 or text (208) 398-0635
Keep learning
Sources: 49 CFR 382.603: Training for supervisors · 49 CFR 382.307: Reasonable suspicion testing · 49 CFR 382.401: Retention of records · FMCSA: DOT Drug and Alcohol Supervisor Training Guidance
Last updated October 7, 2026. Rules reflect 49 CFR Part 382 as of that date.