7.4 Drug and Alcohol Testing Programs (49 CFR Part 40 & Non-DOT)

7.4 Drug and Alcohol Testing Programs (49 CFR Part 40 & Non-DOT)

Quick Summary: "Drug and Alcohol Programs" is one of only three sub-topics inside the Compliance sub-domain (20 of 135 scored items), so it carries real exam weight. Two separate regulatory universes exist: federally regulated DOT testing under 49 CFR Part 40, which prescribes every procedural step, and non-DOT company testing, which is governed by state law and employer policy. The occupational health nurse (OHN) is rarely the collector and never the Medical Review Officer by default, but is very often the Designated Employer Representative (DER), the supervisor trainer, and the custodian of the recordkeeping — so the OHN must know exactly where nursing authority begins and ends.

Two Regulatory Universes: DOT vs. Non-DOT

Exam Trap Warning: The Drug-Free Workplace Act of 1988 is the single most misremembered item in this topic. It applies to federal contractors whose contracts exceed the federal simplified acquisition threshold, and to all federal grantees, and it requires a written policy statement, a drug-free awareness program, and employee notification of a workplace drug conviction no later than 5 days after the conviction (the employer then notifies the contracting agency within 10 days of learning of it). It does NOT require drug testing of anyone. If a question asks which law "mandates workplace drug testing," the Drug-Free Workplace Act is the distractor, not the answer.

The Six DOT Test Types & 2026 Random Rates

1. Pre-employment — required before an employee first performs a safety-sensitive function.
2. Random — unannounced, spread reasonably across the calendar year, drawn from a scientifically valid random pool.
3. Post-accident — the trigger conditions differ. Under 49 CFR 382.303, a human fatality requires testing whether or not the driver is cited. Bodily injury requiring immediate medical treatment away from the scene, or disabling damage requiring a vehicle to be towed, requires testing only if the driver also receives a citation for a moving violation arising from the accident — within 8 hours for alcohol and 32 hours for drugs. Alcohol testing should occur within 2 hours; after 8 hours the employer must stop attempting and document why.
4. Reasonable suspicion — based on specific, contemporaneous, articulable observations of appearance, behavior, speech, or body odor made by a trained supervisor. A hunch, a rumor, or a co-worker's complaint is not enough.
5. Return-to-duty (RTD) — after a violation, and always directly observed.
6. Follow-up — an unannounced schedule set by the Substance Abuse Professional after return to duty.

The rates are annual pool percentages, not per-employee schedules: a 50% rate means the employer must conduct random drug tests equal to 50% of the average number of covered employees over the year. FMCSA's rate is tied to industry data under 49 CFR 382.305 — it rises to 50% when the industry-wide positive rate reaches 1.0% and can only fall back to 25% after two consecutive years below that threshold.

The DOT 5-Panel and the Collection Process

The federally mandated panel tests five drug classes:

1. Marijuana (THC metabolite)
2. Cocaine
3. Opioids — codeine, morphine, 6-acetylmorphine (the heroin marker), plus hydrocodone, hydromorphone, oxycodone, and oxymorphone
4. Amphetamines — amphetamine, methamphetamine, MDMA, MDA
5. Phencyclidine (PCP)

Collection facts the exam likes:

• The specimen is urine, minimum 45 mL, split into a primary Bottle A and a split Bottle B.
• Temperature must read 90–100 degrees Fahrenheit (32–38 degrees Celsius), and the collector must read and record it within 4 minutes of receiving the specimen. An out-of-range temperature triggers an immediate second, directly observed collection.
• Everything is recorded on the Federal Drug Testing Custody and Control Form (CCF), which establishes the chain of custody — the documented, unbroken record of who handled the specimen and when. A break in chain of custody can invalidate an otherwise positive result.
• Oral fluid collection was authorized in Part 40 by the May 2023 final rule, but it is not yet usable in practice: the Department of Health and Human Services has certified no laboratories to analyze oral fluid for DOT testing. DOT's final rule of May 11, 2026 (effective June 10, 2026) amended the directly observed collection provision precisely because the 2023 rule required a switch to oral fluid that could not actually be performed. Urine remains the operative DOT specimen.

The Medical Review Officer (MRO) and the Split Specimen

A laboratory does not report a "positive" to the employer. It reports a confirmed laboratory result to the Medical Review Officer — a licensed physician with specific knowledge of substance abuse disorders and Part 40, who is trained and certified for the role.

The MRO must attempt to contact the employee directly and confidentially, and must determine whether there is a legitimate medical explanation for the result:

• A valid prescription taken as prescribed → the MRO verifies the result as negative.
• No legitimate medical explanation → the MRO verifies the result as positive and reports it to the DER.
• A state medical-marijuana authorization is NOT a legitimate medical explanation. The MRO must verify a marijuana positive as positive regardless of state law, because marijuana remains a Schedule I substance federally.

When the MRO reports a verified positive, adulterated, or substituted result, the employee has 72 hours from that notification to request that the split specimen (Bottle B) be tested at a second HHS-certified laboratory. If Bottle B fails to reconfirm, the entire test is cancelled.

Exam Trap Warning: The OHN does not "verify" a drug test, does not "clear" a positive, and does not decide whether conduct was a refusal. The MRO verifies results; the employer (DER) has the non-delegable duty to decide whether a refusal occurred. An OHN who is not a physician cannot serve as MRO.

Insufficient Specimen ("Shy Bladder") and Refusals

Under 49 CFR 40.193, when an employee cannot provide at least 45 mL:

1. The collector discards the insufficient specimen and urges the employee to drink up to 40 ounces of fluid, distributed reasonably over up to three hours, or until a sufficient specimen is produced.
2. Declining to drink is not, by itself, a refusal. But the employee must remain at the collection site — leaving before the process is complete is a refusal.
3. If no sufficient specimen is produced within the three-hour window, the collector discontinues the collection and notifies the DER. The employer must then direct the employee to obtain an evaluation from a licensed physician within five days. The MRO decides whether a medical condition explains the failure (test cancelled) or not (refusal).

A refusal to test carries the same consequences as a verified positive. Refusals include failing to appear within a reasonable time, leaving the collection site before the process is complete, failing to provide a sufficient specimen without an adequate medical explanation, tampering with or substituting a specimen, refusing a directly observed collection, refusing the required medical evaluation, and failing to sign the certification on the ATF.

Alcohol Testing Thresholds and Procedure

Alcohol testing is procedurally distinct from drug testing and is a reliable source of exam items:

• Screening may be performed with an approved saliva device or an Evidential Breath Testing (EBT) device. Confirmation must be performed on an EBT — breath only. Blood and urine alcohol tests are not authorized under Part 40.
• A screening result of 0.02 or higher requires a confirmation test.
• The confirmation test must be conducted after a minimum 15-minute waiting period, during which the employee must not eat, drink, smoke, chew gum, or belch. Conducting the confirmation test before the 15 minutes have elapsed is a fatal flaw that cancels the test.
• 0.02 to 0.039 — not a Part 40 violation, but the employee must be removed from safety-sensitive functions under the modal agency rule for a specified period.
• 0.04 or higher — a violation. Immediate removal from safety-sensitive duty and referral into the return-to-duty process.
• A cancelled test is neither positive nor negative. It does not count toward the minimum random rate, and it cannot be used where a negative result is required (such as a return-to-duty test).

Return-to-Duty: The SAP Process

An employee with any violation may not resume safety-sensitive functions until completing the Substance Abuse Professional (SAP) process: SAP evaluation, completion of the SAP-prescribed education and/or treatment, a SAP follow-up evaluation, and a directly observed return-to-duty test with a negative result. The SAP then sets an unannounced follow-up testing plan of at least 6 tests in the first 12 months, which the SAP may extend for up to 60 months. For CDL drivers, violations and the RTD process are also recorded in the FMCSA Drug and Alcohol Clearinghouse.

The OHN's Recordkeeping and ADA Boundaries

• Segregate the records. Drug and alcohol testing records are kept separate from the employee medical record, separate from the personnel file, and separate from OSHA injury and illness records.
• ADA distinction: a test for current illegal drug use is not a "medical examination" under the ADA, so it may be required pre-offer. An alcohol test IS a medical examination and may only be required post-offer and, for current employees, when job-related and consistent with business necessity.
• Current illegal drug use is not protected by the ADA. A person who has successfully completed or is enrolled in rehabilitation and is no longer using may be a protected individual with a disability.
• The OHN should train supervisors in the objective, contemporaneous documentation that a reasonable-suspicion referral requires, and should never allow a supervisor to make a clinical diagnosis in that documentation.