What Counts as Refusing a DOT Drug or Alcohol Test?

Under FMCSA rules, a refusal to submit to a required DOT drug or alcohol test is prohibited conduct. The driver must be removed from safety-sensitive work and cannot return to driving or other DOT safety-sensitive functions until the federal return-to-duty requirements have been completed.

A refusal is not the same laboratory result as a positive test. The Clearinghouse record identifies it as a refusal. But the immediate federal consequences are similar: the driver becomes prohibited from performing safety-sensitive functions and must complete the applicable Substance Abuse Professional and return-to-duty process before becoming eligible to return.

The FMCSA prohibition appears in 49 CFR § 382.211, and the removal requirement appears in 49 CFR §§ 382.501 and 382.503.

Federal drug-testing rules identify several different forms of refusal. A driver may be found to have refused a DOT drug test by:

• Failing to appear for a required test within a reasonable time after being directed to report, except for the specific pre-employment exception explained below
• Failing to remain at the testing site until the process is complete
• Failing to provide a required urine or oral-fluid specimen
• Refusing to permit a directly observed or monitored urine collection
• Failing to provide enough specimen when a required medical evaluation finds no adequate medical explanation
• Refusing an additional drug test directed by the employer or collector
• Failing to complete a required medical examination or evaluation
• Failing to cooperate with any part of the collection
• Refusing required instructions during a directly observed urine collection
• Possessing or wearing a prosthetic or other device that could be used to interfere with the collection
• Admitting to the collector or Medical Review Officer that the specimen was adulterated or substituted
• Having a specimen verified by the Medical Review Officer as adulterated or substituted

The complete federal drug-test refusal rule appears in 49 CFR § 40.191.

A driver may be found to have refused a required DOT alcohol test by:

• Failing to appear within a reasonable time after being directed to report, except for the pre-employment exception in the general DOT rule
• Failing to remain at the testing site until the process is complete
• Failing to provide enough breath or saliva to complete the test
• Refusing to make the required attempt to provide a sufficient breath sample
• Failing to complete a required medical evaluation after an insufficient breath sample
• Having no adequate medical explanation for being unable to provide sufficient breath
• Failing to sign the certification in Step 2 of the Alcohol Testing Form
• Failing to cooperate with any part of the alcohol-testing process

The federal alcohol-test refusal rule appears in 49 CFR § 40.261.

The answer depends on the type of event.

For most required DOT tests, failing to appear within a reasonable time after the employer directs the driver to report can be a refusal.

This can apply to:

• Random tests
• Reasonable-suspicion tests
• Post-accident tests
• Return-to-duty tests
• Follow-up tests

The employer determines what constitutes a reasonable reporting time, consistent with the applicable DOT rules. A driver should not assume that arriving late is acceptable simply because the testing site remains open.

If a driver is lost, delayed by a breakdown, sent to the wrong location, or unable to enter the facility, the driver should contact the employer and collection site immediately. The important facts may include when the driver was notified, where the driver was told to report, when the driver arrived or attempted to arrive, and what communications occurred.

Leaving too soon is one of the most preventable ways a testing problem can become a refusal.

A driver may believe the test is finished because a specimen was provided, a breath sample was attempted, or paperwork appears complete. But the process may still require:

• A second specimen
• A directly observed or monitored collection
• Completion of the shy-bladder procedure
• Another breath attempt
• A confirmation alcohol test
• A corrected form or collection step
• Instructions from the collector or employer

The collector is not required to warn the driver that leaving will be considered a refusal. The urine and oral-fluid collection rules direct the collector to tell the driver when the driver may leave after the process is complete.

An urgent call, family problem, dispatch issue, parking concern, illness, or other unexpected event does not automatically cancel the testing process.

If something happens while the driver is at the site:

1. Tell the collector immediately.
2. Do not simply walk out, even if the reason feels obvious or urgent.
3. Ask the collector what the DOT procedure requires at that stage.
4. Ask that the employer's Designated Employer Representative be contacted if a decision is needed.
5. If emergency medical care is necessary, obtain it and make sure the employer is informed as quickly as possible.

Telling the collector why the driver wants to leave does not guarantee that leaving will not be treated as a refusal. The employer may still have to evaluate the facts. The driver's best protection is clear, immediate communication and continued cooperation whenever safely possible.

An initial inability to provide 45 milliliters of urine is not automatically a refusal. It begins the federal insufficient-specimen procedure often called the "shy bladder" process.

When the collection continues with urine:

• The collector discards the insufficient specimen unless a special rule requires otherwise.
• The driver must be given another opportunity to provide a sufficient specimen.
• The collector urges the driver to drink up to 40 ounces of fluid, reasonably distributed over a period of up to three hours.
• The collector tells the driver when the three-hour period begins and ends.
• The driver is not required to drink the offered fluid, and declining to drink is not itself a refusal.
• The driver must remain at the collection site and continue making the required attempts.

The critical distinction is between being unable to provide enough urine and refusing to try or leaving. Refusing to make another attempt or leaving before the process is complete can be reported to the employer for a refusal determination.

If the driver still cannot provide enough urine by the end of the required period, the collector ends the collection and notifies the employer. The employer, after consulting with the MRO, must direct the driver to obtain a medical evaluation within five days from a qualified physician acceptable to the MRO.

The physician evaluates whether a medical condition has, or with a high degree of probability could have, prevented the driver from providing a sufficient specimen. The MRO makes the final determination for the drug test:

• If an adequate medical explanation is established, the test is cancelled.
• If no adequate medical basis is established, the MRO reports a refusal.
• If the driver fails to complete the required medical evaluation, that failure can itself be a refusal.

For this purpose, the rule recognizes an ascertainable physiological condition or a medically documented pre-existing psychological disorder. Unsupported claims of situational anxiety or dehydration are not treated as an adequate medical explanation under the rule.

The full procedure appears in 49 CFR § 40.193.

Part 40 also contains an insufficient-specimen procedure for a DOT oral-fluid drug collection.

The required specimen is 2 milliliters in a single sampling. If the driver cannot provide enough oral fluid:

• The collector provides another opportunity using the required procedure.
• A wait period of up to one hour may apply.
• In specified circumstances, the collector may urge the driver to drink up to 8 ounces of fluid and wait before another attempt.
• Declining to drink is not itself a refusal.
• The driver must remain in the monitored area designated by the collector during the wait.

If a sufficient specimen still cannot be provided, the medical-evaluation process described in § 40.193 applies to the final specimen method used at the collection site.

Again, inability is not automatically refusal. Leaving, refusing the required attempt, failing to complete the medical evaluation, or having no adequate medical explanation can turn the event into a refusal.

An initial inability to provide a sufficient breath sample for a DOT alcohol test is also not automatically a refusal.

The Breath Alcohol Technician or Screening Test Technician must instruct the driver to try again and explain the proper way to provide the sample. The technician may allow another attempt when there is a strong likelihood it will succeed and may use other procedures permitted by the rule.

If the driver refuses to make the required attempt, that is a refusal. If the driver tries but remains unable to provide enough breath, the employer must direct the driver to obtain a medical evaluation within five days from an acceptable licensed physician with appropriate expertise.

The physician determines whether a medical condition could have prevented the driver from providing enough breath:

• If there is an adequate medical explanation, the test is cancelled.
• If there is no adequate medical basis, the result is a refusal.
• Failing to undergo the required evaluation is also a refusal.

The federal "shy lung" procedure appears in 49 CFR § 40.265.

Some DOT urine collections must be directly observed or monitored. Return-to-duty and follow-up drug tests require direct observation. Other events—such as certain specimen-temperature, tampering, invalid-result, or negative-dilute situations—can also require an immediate observed recollection.

During a directly observed urine collection, the observer must follow specific federal procedures. The driver must permit the observation and follow required instructions designed to determine whether a prosthetic or other device is being used to interfere with the collection.

A driver can create a refusal by:

• Declining to permit a required direct observation or monitoring
• Refusing to follow the observer's required clothing and turn-around instructions
• Refusing to provide the second specimen after being directed to do so

The observation requirement is a federal testing procedure. A driver who is surprised, embarrassed, or concerned should state the concern and ask the collector to explain the requirement, but should not simply leave or refuse the procedure.

The direct-observation rules appear in 49 CFR § 40.67.

Providing one specimen does not always finish the testing event.

Federal procedures may require an immediate second collection because:

• The urine temperature is outside the permitted range
• The specimen shows signs of tampering
• The laboratory reports certain invalid or negative-dilute results
• The original collection should have been observed but was not
• A cancelled test must be repeated because a negative result is required
• Another problem must be corrected to complete a valid test

When the employer or collector directs an additional test under the DOT rules, refusing or failing to complete it can be a refusal. The driver should not assume that the first specimen "counts" or that providing it gives the driver the right to decline the second one.

The federal rule includes failure to cooperate with any part of the testing process. Examples in the drug-testing rule include:

• Refusing to empty pockets when directed
• Behaving in a confrontational way that disrupts the collection
• Failing to wash hands when directed
• Failing to remove objects from the mouth
• Refusing an inspection of the oral cavity
• Failing to complete a required mouth rinse

This does not mean a driver is forbidden from asking a respectful question or identifying a genuine problem. The issue is whether the driver follows the required procedure and allows the testing process to continue.

If a driver believes an instruction is unusual or incorrect, the safer response is to:

1. Ask the collector to explain the instruction.
2. Ask whether it is required under the DOT procedure.
3. Request that the employer's Designated Employer Representative be contacted if necessary.
4. Avoid arguing, threatening, disrupting the site, or walking away.
5. Complete the required process if able and document the concern afterward.

A verified adulterated or substituted drug-test result is treated as a refusal under federal DOT rules.

A refusal may also result when a driver:

• Possesses or wears a prosthetic or other device that could be used to interfere with the collection
• Admits to the collector or MRO that the specimen was adulterated or substituted
• Clearly attempts to bring an adulterant or substitute into the collection process

These are refusal provisions, not positive-test provisions. The record may show a refusal based on adulteration or substitution rather than a positive result for a specific drug.

The signature rules are not identical.

A driver who is subject to FMCSA post-accident testing must remain readily available for the required testing. The employer may deem failure to remain available a refusal.

This does not require an injured driver to delay necessary medical attention. It also does not prevent a driver from leaving the accident scene for the time needed to obtain emergency help or necessary medical care.

The practical rule is to remain in communication with the employer and follow the company's post-accident instructions. Do not leave the area, go home, consume alcohol, or decide independently that testing is no longer necessary while the post-accident testing window is still open.

FMCSA's post-accident availability requirement appears in 49 CFR § 382.303.

The following events are not automatically refusals by themselves:

When a refusal is determined under the FMCSA rules:

• The driver must be removed from DOT safety-sensitive functions.
• The violation is reported to the FMCSA Drug and Alcohol Clearinghouse by the responsible employer or Medical Review Officer.
• The driver's Clearinghouse status becomes prohibited.
• The driver cannot drive a commercial motor vehicle or perform other DOT safety-sensitive functions until the applicable federal return-to-duty requirements are completed.
• The driver's commercial driving privilege may be downgraded under the Clearinghouse-II requirements.

Employers generally report the refusal determinations for conduct at the testing site and for alcohol tests. MROs report drug-test refusals that require an MRO determination, including adulterated or substituted specimens and insufficient specimens without an adequate medical explanation. The reporting responsibilities and deadlines appear in 49 CFR § 382.705.

The separate guide After a Failed DOT Drug Test: The SAP and Return-to-Duty Process explains the federal process that follows a DOT drug or alcohol violation.