Learn how FMCSA reasonable-suspicion testing works: trained-supervisor observations, alcohol timing limits, written records, driver removal and compliant next steps.
Reasonable suspicion is a specific federal testing basis
Under 49 CFR 382.307, a motor carrier must require an alcohol or controlled-substances test when a properly trained supervisor or company official has reasonable suspicion that a covered driver violated the applicable Part 382 prohibition. This is not a random selection, post-accident test or general fitness-for-duty exam. The decision must be tied to current, explainable facts and the correct federal testing category.
The rule requires specific, contemporaneous and articulable observations
The determination must rest on observations that are specific enough to describe, contemporaneous with the event and capable of being stated clearly. The regulation identifies appearance, behavior, speech and body odors. A report such as unsteady movement, confused responses or an odor should identify what the observer actually perceived, where and when it occurred, without turning an observation into a diagnosis.
A rumor or personality conflict is not the required foundation
Anonymous gossip, a prior disagreement, an old attendance problem or a supervisor's unsupported feeling does not by itself satisfy the observation standard. Information from another person can trigger a safety check, but the trained official who makes the federal determination should personally establish the specific present facts required by the rule. Separate policy or employment issues from the Part 382 testing decision.
Drug observations can include chronic and withdrawal effects
For controlled substances, section 382.307 allows the observations to include indications of chronic use and withdrawal effects. That does not authorize a supervisor to identify a substance or medical condition. The role is to document observable indicators and apply training, then let the regulated collection, laboratory and medical-review process determine the test result.
The decision belongs to a trained supervisor or company official
The required observations must be made by a supervisor or company official trained under section 382.603. A dispatcher, customer, coworker or security employee who lacks that training may report a concern, but should not be presented as the trained decision-maker unless the person has actually completed the required instruction and holds the designated role.
Supervisor training has two separate 60-minute components
Each person designated to supervise drivers must receive at least 60 minutes of training on alcohol misuse and at least an additional 60 minutes on controlled-substances use. The content includes physical, behavioral, speech and performance indicators. The federal rule does not require recurrent training, but carriers should preserve proof of the original training and refresh procedures when staff, testing vendors or company policies change.
The alcohol decision-maker cannot administer the alcohol test
The person who determines that reasonable suspicion exists for an alcohol test may not conduct that driver's alcohol test. This separation protects the regulated collection process from becoming an extension of the supervisor's observation. Use a qualified screening-test technician or breath-alcohol technician and follow Part 40 procedures.
Alcohol observations have a narrow safety-sensitive window
Reasonable-suspicion alcohol observations must be made during, just before or just after the period in which the driver is required to comply with Part 382. The driver may be directed to an alcohol test only while performing a safety-sensitive function, just before performing it or just after stopping it. A controlled-substances test does not use the same alcohol-specific timing limitation.
The two-hour point requires an explanation
A required alcohol test should be administered promptly. If it is not administered within two hours after the reasonable-suspicion determination, the employer must prepare and maintain a record stating why it was not promptly completed. The two-hour point does not end the testing effort; it creates a documentation duty while reasonable attempts continue.
Stop alcohol-testing attempts after eight hours
If the alcohol test is still not administered within eight hours after the determination, the employer must cease attempts and record why the test was not administered. Document the actual timeline, instructions, collection-site contacts, transportation and any operational problem. A generic note that testing was unavailable provides less evidence than a precise chronology.
Protect people before arranging the collection
Do not allow a driver whose observed condition raises a safety concern to continue driving to the test site. Use safe transportation, protect the vehicle and cargo, address medical emergencies and follow site-security procedures. A supervisor should not attempt to search the driver, seize medication or conduct an improvised impairment examination.
A driver cannot perform safety-sensitive work during the alcohol hold
Even if an alcohol test is not obtained, the employer may not permit the driver to perform or continue safety-sensitive functions while the observed indicators show alcohol influence or impairment. The federal restriction lasts until a test measures less than 0.02 or 24 hours have elapsed after the reasonable-suspicion determination.
The 24-hour restriction is not a return-to-duty clearance
Waiting 24 hours does not erase a verified violation, refusal, medical concern or independent company action. It is the outside period stated in the reasonable-suspicion alcohol provision when a qualifying test is absent. A positive or refusal invokes the applicable removal and return-to-duty process; a carrier should never describe the passage of time as proof that a driver is fit.
Federal action based only on appearance has a limit
Except for keeping the driver from safety-sensitive work under the specific no-test provision, section 382.307 says an employer may not take action under Part 382 solely from behavior and appearance concerning alcohol when no alcohol test exists. The rule also preserves action under independent authority when otherwise lawful. Carriers should identify which legal or policy authority supports each decision.
Create and sign the observation record quickly
A written record of the observations leading to an alcohol or controlled-substances reasonable-suspicion test must be made and signed by the supervisor or company official who observed them. It is due within 24 hours of the observed behavior or before the test results are released, whichever occurs first. Write objective details while they are fresh and do not alter the record after learning the result.
Record facts, sequence and source—not conclusions
A strong record identifies the driver, observer, date, exact times, location, safety-sensitive function, each observable indicator, the testing determination, notification, transportation and collection attempts. Separate the observer's direct perceptions from statements made by others. Avoid labels such as drunk, high or addicted unless reporting a verified statement or result from an authorized source.
Retain the right documents for the right period
Section 382.401 requires documents generated in connection with reasonable-suspicion decisions as collection-process records, generally for at least two years. Supervisor-training records remain while the person performs the trained function and for two years afterward. Negative or canceled drug results and alcohol results below 0.02 generally require one year, while positives, refusals and specified program records generally require five years.
A refusal creates a separate compliance path
A covered driver who refuses a required reasonable-suspicion test must be removed from safety-sensitive functions and handled under the federal refusal and return-to-duty requirements. The supervisor should not negotiate away the test, order a different testing category or let the driver resume work because the shift is difficult to cover. Document the instruction and collection-site information accurately.
Use a controlled response checklist
Confirm that the driver and function are covered, protect immediate safety, involve a trained official, record specific current observations, select the correct test type, stop safety-sensitive work, arrange safe transportation, meet the alcohol timing rules, complete the signed observation record, secure the documents and follow the verified result. This guide is educational and does not replace current regulations, Part 40 procedures, medical care, legal advice or a carrier's compliant policy.
Continue with CDL Truck Pro
Official sources
49 CFR 382.307: Reasonable suspicion testing49 CFR 382.603: Training for supervisors49 CFR 382.401: Retention of records49 CFR Part 40: DOT testing proceduresCDL Truck Pro provides educational information. Confirm licensing, safety, tax, and regulatory requirements through current official sources and qualified professionals.