Refusal to test: what counts, how to fight one, and what the employer must do next

How to fight a refusal on a DOT drug test starts with one fact: once a refusal stands, no arbitrator, grievance or state court can set aside its DOT consequences (49 CFR 40.191(c)).

So the real fight happens earlier. It is about whether the conduct was a refusal at all, whether the employer decided it properly, and whether it was reported correctly. That is what this page covers, for drivers and for the employers who have to make the call.

This is a plain-language guide to the federal rules, not legal advice.

What counts as a refusal to take a DOT drug test

49 CFR 40.191(a) lists the conduct. A driver has refused a DOT drug test if they:

1. Do not show up for a test within a reasonable time after being told to, as the employer decides. This does not apply to pre-employment tests. It includes an owner-operator who does not show up when the C/TPA calls.
2. Leave the testing site before the process is complete.
3. Do not provide a specimen.
4. Do not allow a directly observed or monitored collection.
5. Do not provide enough urine, and a medical evaluation finds no adequate medical reason.
6. Decline an additional test the employer or collector directs, such as a recollection after a dilute result (40.197(b)).
7. Do not go to a medical evaluation the MRO or DER directs.
8. Do not cooperate. The rule's own examples: refusing to empty pockets, being confrontational enough to disrupt the collection, refusing to wash hands when told.
9. During an observed collection, do not follow the observer's instructions on clothing.
10. Have or wear a prosthetic or other device that could interfere with the collection.
11. Admit to the collector or MRO that they adulterated or substituted the specimen.

On top of the list, a verified adulterated or substituted result from the MRO is a refusal (40.191(b)).

What counts as a refusal to take a DOT alcohol test

The alcohol list in 49 CFR 40.261(a) is shorter. It covers not showing up in a reasonable time (except pre-employment), leaving before the test is complete, not giving enough breath or saliva, a shy-lung failure with no medical explanation, skipping the medical evaluation, not signing Step 2 of the Alcohol Testing Form, and not cooperating.

If an employee cannot give enough saliva on a screening device, the screener tries a new device. Refusing that second attempt is a refusal (40.263(a)(2)).

What does not count as a refusal

These are the details that matter most if you are trying to fight a refusal.

• Leaving a pre-employment test before it starts. A candidate who leaves before the testing process commences has not refused (40.191(a)(2) and (a)(3)). For a urine test, the process starts when the collection container is unwrapped or its seal is broken (40.63(c)).
• A pre-employment medical evaluation with no job offer. Skipping an MRO-directed medical exam is a refusal on a pre-employment test only if the test followed a contingent offer of employment. With no offer, the MRO cancels the test (40.191(a)(7)).
• Declining to drink during a shy bladder wait. The collector urges up to 40 ounces over up to three hours, but declining to drink is not a refusal (40.193(b)(1)(ii)).
• A shy bladder with a real medical cause. If the evaluating physician finds a medical condition that could have prevented a sufficient specimen, the MRO cancels the test (40.193(d)(1)). "Situational anxiety" and dehydration do not count as medical conditions (40.193(e)).
• Refusing a non-DOT test. Refusing a non-DOT test, or refusing to sign a non-DOT form, is not a DOT refusal (40.191(e), 40.261(d)).

Who decides it was a refusal

Not the collector. The collector stops the collection, notes what happened in the Remarks line of the form, and notifies the DER immediately (40.191(d)(1)).

The decision belongs to the employer, and it is non-delegable (40.355(i)). A C/TPA or other service agent can advise but cannot make the call. There are two exceptions. A C/TPA can decide a refusal when an owner-operator does not show up for a test it scheduled. An MRO decides refusals based on adulteration or substitution (40.355(j)).

Shy bladder and medical-evaluation cases end with an MRO determination after the physician's evaluation (40.193(d)(2)).

How to fight a refusal on a DOT drug test

If you are a driver, these are the routes the regulations actually give you:

• Before the employer decides. The employer has to decide whether a refusal happened. If you left because of an emergency or the "no-show" notice never reached you, the employer is the one weighing that. Give your account and any proof to the DER while the decision is still open.
• A shy bladder or shy lung. Go to the medical evaluation you are directed to. Skipping it is itself a refusal. A documented medical condition leads to a cancelled test, not a refusal.
• Adulterated or substituted results. You have 72 hours from the MRO's notice to ask for the split specimen to be tested at a second laboratory (40.171(a)).
• A Clearinghouse report. A petition to FMCSA under 49 CFR 382.717 can correct administrative errors, such as a duplicate or mistyped report. It cannot contest whether a refusal happened. There is one exception: an employer's report of a no-show refusal can be removed if it does not include the documentation 382.705(b)(3) requires, such as proof of when and where you were told to report. FMCSA decides a complete petition within 45 days.

What does not work: going to an arbitrator, filing a grievance or suing in state court to undo the DOT consequences (40.191(c)). Those forums can address the employment decision. They cannot change the DOT violation.

What the employer must do next

Once the DER decides a refusal happened, the steps are fixed.

1. Remove the driver from safety-sensitive work. No employer may let a driver who refuses a required test perform safety-sensitive functions (382.211). For a verified adulterated or substituted result, act on the first report (40.23(b)).
2. Report it to the Clearinghouse by the end of the third business day. The employer reports alcohol refusals and drug refusals that do not need an MRO decision. The MRO reports the ones it decides: adulterated, substituted, shy bladder after evaluation, and skipped medical exams (382.705(a) and (b)).
3. Keep the paper trail for a no-show refusal. For a no-show, the report has to include proof of when the driver was told to report and where, and the employer has to give the driver a copy of what was reported (382.705(b)(3)).
4. Give the driver the SAP list. Names, addresses and phone numbers of SAPs, free of charge, including for applicants (40.287).
5. Keep the record for 5 years. Documentation of refusals has to be kept at least 5 years (382.401(b)(1)(iii)).

A refusal starts the same SAP and return-to-duty process as a positive. Our pillar on what happens if a driver fails or refuses a DOT drug test walks through it step by step.

Post-accident: stay available

A driver who has to take a post-accident test has to stay readily available, or the employer can treat it as a refusal (382.303(e)). Getting medical care and helping at the scene are allowed. Disappearing is not.

Frequently asked questions

Is walking out of a DOT drug test a refusal?

Usually, yes. Leaving before the testing process is complete is a refusal under 40.191(a)(2). The exception is a pre-employment test where the candidate leaves before the process has started. The employer, not the collector, makes the final decision.

Is a shy bladder a refusal?

Not on its own. The driver gets up to three hours, then a medical evaluation within five days. It becomes a refusal only if the evaluation finds no adequate medical explanation.

Can a refusal be removed from the Clearinghouse?

Only in narrow cases. A petition under 382.717 corrects administrative errors and can remove a no-show report that lacks the required documentation. Otherwise the refusal stays until the return-to-duty process is complete and 5 years have passed.

Does a refusal on a pre-employment test count?

It can. Most of the refusal list applies to pre-employment tests. A no-show is the exception, and so is leaving before the collection starts.

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