Frequently Asked Questions
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Clear allWho Is a Safety-Sensitive Employee under FTA Rules?
Under 49 CFR Part 655, anyone, including an applicant or transferee, who performs a safety-sensitive function such as operating or maintaining a revenue service vehicle or dispatching it.
Read moreWhich Drivers Does FMCSA Drug and Alcohol Testing Cover?
Part 382 covers drivers who operate a commercial motor vehicle in commerce and are subject to CDL requirements under Part 383 (49 CFR 382.103(a)). A CMV includes vehicles of 26,001 pounds or more.
Read moreWhat Must a DOT Drug and Alcohol Policy Include?
FMCSA, FTA and PHMSA each require written policy content, such as testing triggers, refusal consequences and who answers questions. FMCSA drivers also sign a certificate of receipt.
Read moreHow Does DOT Follow-Up Testing Work after a Violation?
After return-to-duty, a SAP sets unannounced follow-up testing: at least six tests in the first 12 months, extendable up to 60 months. The employer picks the dates and keeps them unannounced.
Read moreHow Do DOT Employers Check Previous Employer Drug Test Records?
Before first safety-sensitive duty, the employer gets the employee's written consent and requests two years of testing history from previous DOT employers (49 CFR 40.25).
Read moreHow Long Must DOT Drug and Alcohol Testing Records Be Kept?
Part 40 sets five years for positives and refusals, three for previous-employer data, two for breath device records and one for negatives. FMCSA, FTA and PHMSA add their own periods.
Read moreWhat Is the DOT MIS Report and Who Must File It?
The MIS report is an annual summary of the prior year's DOT testing results. Each agency sets who files; reporting deadlines are generally March 15 when filing applies.
Read moreWhich Drug and Alcohol Violations Fail an FMCSA New Entrant Audit?
Five drug and alcohol violations cause an automatic failure of the FMCSA new entrant audit, including no testing program, no random program, and using a driver who tested positive or refused.
Read moreHow Does an FMCSA Voluntary Self-Identification Program Work?
A voluntary self-identification program lets a driver admit a problem before reporting for duty without triggering referral and treatment rules, if the written program meets the rule.
Read moreWhat Is Actual Knowledge under FMCSA Drug and Alcohol Rules?
Actual knowledge means the employer knows of use through direct observation, a previous employer, a traffic citation, or the driver's admission (49 CFR 382.107). Signs of impairment do not count.
Read moreWhat Drug and Alcohol Conduct Do FMCSA Rules Prohibit?
Subpart B of Part 382 bars alcohol at 0.04 or higher, on-duty use, use within four hours before duty, use after an accident, certain drug use, positive or tampered tests, and refusals.
Read moreCan a DOT Employer Also Run Non-DOT Tests on Covered Employees?
Yes. Non-DOT tests must stay completely separate from DOT tests: the DOT test goes first, uses its own forms, and no DOT result can be changed or ignored based on a non-DOT result (49 CFR 40.13).
Read moreWhen Is FMCSA Post-Accident Drug and Alcohol Testing Required?
FMCSA post-accident testing is required after a fatality, or after injury treated away from the scene or a tow-away when the driver is cited. Alcohol tests are due within 8 hours, drug within 32.
Read moreWhen Must FTA Transit Employers Conduct Post-Accident Testing?
FTA requires tests after a death, medical treatment away from the scene, or disabling damage or removal of the vehicle. An employer that decides not to test must document that decision in detail.
Read moreWhen Must FAA-Regulated Employers Conduct Post-Accident Testing?
FAA post-accident testing covers any employee in one of nine safety-sensitive functions whose performance contributed or cannot be completely discounted, not just the flight crew (14 CFR Part 120).
Read moreWhen Must PHMSA Pipeline Operators Conduct Post-Accident Testing?
PHMSA requires testing of each covered employee whose performance contributed or cannot be completely discounted after an accident reportable under Part 191 or 195. Drug tests are due within 32 hours.
Read moreWhat Does DOT Drug and Alcohol Compliance Require of Employers?
Employers follow Part 40 plus their agency's rules, with a program from day one, a written policy, an in-house designated employer representative, required test types and background checks.
Read moreWhat Do FMCSA Rules Require for Pre-Trip and Post-Trip Inspections?
FMCSA rules require a driver to confirm before driving that key parts are in good working order and to review the last inspection report. At day's end the driver reports defects in writing.
Read moreWhich Aviation Employees Are Subject to FAA Drug and Alcohol Testing?
FAA testing under 14 CFR Part 120 covers employees in nine safety-sensitive functions, including flight crew, dispatchers and maintenance, at employers operating under Part 121 or 135 and others.
Read moreHow Does FRA Random Drug and Alcohol Testing Work?
Each railroad submits a random testing plan for FRA approval and gives every regulated employee an equal chance of selection. Pools need at least four entries, with selections every three months.
Read moreWho Is Covered by PHMSA Drug and Alcohol Testing?
PHMSA testing covers anyone performing a covered operations, maintenance or emergency-response function on a pipeline or LNG facility, including contractors and their employees (49 CFR Part 199).
Read moreWhat Drug and Alcohol Testing Is Required after a Serious Marine Incident?
After a serious marine incident, the Coast Guard requires the marine employer to have each person directly involved tested for drugs and alcohol (46 CFR 16.240). Several kinds of casualties qualify.
Read moreHow Are FMCSA Minimum Annual Random Testing Rates Set, and What Are They This Year?
For 2026, the FMCSA minimum random rates are 50 percent for drugs and 10 percent for alcohol of average driver positions. The Administrator can change them based on annual MIS report data.
Read moreHow Must a Motor Carrier Select and Notify Drivers for Random Tests?
Carriers must pick drivers by a scientifically valid method, such as a random number generator, and give each driver in the pool an equal chance each time (49 CFR 382.305(i)).
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