A pre-employment drug test must be completed — and a verified negative result received — before a safety-sensitive employee can begin performing safety-sensitive functions for the first time. This generally applies to new hires, rehires and employees transferring into a safety-sensitive role — but check the modal rule. FMCSA, for example, provides a defined prior-testing / programme-participation exception to the new pre-employment controlled-substances test at §382.301(b), and pre-employment alcohol testing is optional, permitted on conditions at §382.301(d).
Testing TypeDrug testing where the applicable DOT agency rule requires it. Alcohol testing is generally not required pre-employment, but some modal rules permit it on conditions — FMCSA §382.301(d) is the example. Check the agency rule (no pre-employment alcohol test required under Part 40)
TimingMust have negative result before first safety-sensitive duty
Who DecidesEmployer — required by regulation before safety-sensitive work begins
Key RuleCannot begin duty until negative result is confirmed by MRO
Unannounced testing conducted on a scientifically random basis throughout the year. Every safety-sensitive employee in the random pool must have an equal chance of being selected at any time, regardless of prior test history. When selected, the employee must proceed immediately to the collection site.
FMCSA Rate (Drugs)50% of average number of safety-sensitive employees annually
FMCSA Rate (Alcohol)10% of average number of safety-sensitive employees annually
Selection MethodMust use a scientifically valid random selection method
Employee ObligationMust go immediately — cannot delay, reschedule, or be substituted
Owner-operators cannot be in their own random pool — they must join a consortium managed by a C/TPA to satisfy the random testing requirement.
Required after certain accidents involving safety-sensitive employees. The rules for what triggers a post-accident test and how quickly it must occur vary by DOT agency. FMCSA rules are the most commonly applicable.
FMCSA Post-Accident Triggers:
- Fatal accident: Test the driver who was performing safety-sensitive functions with respect to the vehicle — no citation needed [§382.303(a)(1), (b)(1)]
- Bodily injury with immediate medical treatment away from the scene: Test only if the driver receives a citation for a moving traffic violation [§382.303(a)(2)(i), (b)(2)(i)]
- Disabling damage requiring tow-away: One or more motor vehicles incurring disabling damage that requires it to be transported from the scene by a tow truck or other motor vehicle — test only if the driver receives a citation [§382.303(a)(2)(ii), (b)(2)(ii)]. There is no dollar threshold in FMCSA — the test is tow-away, not repair cost
- Citation windows differ by test: the citation must be issued within 8 hours to require the alcohol test and within 32 hours to require the drug test
Alcohol WindowTest within 2 hours. If not possible, document why. Stop attempting after 8 hours.
Drug WindowTest within 32 hours. If not possible, document why and stop attempting.
A supervisor-initiated test based on specific, documented observations of an employee's appearance, behavior, speech, or body odor that are consistent with drug or alcohol use. The supervisor making the determination must be trained.
Who Can ReferFor FMCSA drivers, a supervisor or company official who has completed §382.603 training (§382.307(c)) — 60 minutes on alcohol misuse plus 60 minutes on controlled substances. The signed written record of the observations is due within 24 hours of the observed behavior, or before the test results are released, whichever is earlier (§382.307(f)). That 60+60 figure is FMCSA-specific; other DOT modes set their own supervisor-training rules and Part 40 imposes none
Alcohol WindowDocument the reason if not done within 2 hours; cease attempts after 8 hours [§382.307(e)(1)]. With no test, the employee stays off safety-sensitive duty until a test reads below 0.02 or 24 hours pass [§382.307(e)(2)]
Drug Window§382.307 sets no deadline for the reasonable-suspicion drug test — the 32-hour figure belongs to post-accident testing. Send the employee as soon as practicable; a stale observation will not support the referral
DocumentationSupervisor must document observations in writing within 24 hours of the observed behavior or before results are released, whichever is earlier (§382.307(f))
Required before a safety-sensitive employee can return to duty after violating DOT drug or alcohol regulations. The employee must first be evaluated by a SAP and be found by the SAP to have successfully complied with the recommendations. Note §40.301(c)(2): the SAP may make that determination even though the employee has not yet completed the full regimen of education or treatment. The SAP’s report is one of the reasons the employer decides on return (§40.301(a)(2)) — passing the RTD test is a prerequisite, not automatic reinstatement. Follow-up testing then happens after the employee is back on safety-sensitive duty. The drug return-to-duty collection must be conducted under direct observation (§40.67(b)). An alcohol return-to-duty test is not “observed” — the requirement there is a result of less than 0.02 (§40.305(a)).
PrerequisiteSAP evaluation and completion of the recommended education/treatment first. Then: drug — a negative result; alcohol — an alcohol concentration of less than 0.02 (§40.305(a)). The two are not both “negative”
Collection MethodDrug: directly observed urine collection (§40.67(b)). Alcohol: not observed — the test must return under 0.02 (§40.305(a))
Result RequiredVerified negative before employee may return to safety-sensitive duty
Who AuthorizesSAP determines when the employee is ready; employer receives SAP report
After returning to duty, the employee enters a mandatory follow-up testing period. All follow-up tests are unannounced. The drug collections are conducted under direct observation (§40.67(b)); alcohol follow-up tests are not observed. The schedule is determined by the SAP.
Minimum RequirementAt least 6 unannounced tests in the first 12 months after returning to duty
Maximum DurationUp to 60 months total follow-up testing period, as directed by SAP
Collection MethodDrug: directly observed (§40.67(b)). Alcohol: not observed. The SAP decides whether follow-up tests are for drugs, alcohol or both (§40.307(c))
Who SchedulesEmployer or C/TPA, based on SAP's prescribed schedule