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Federal and Non-Federal Drug Tests: Which Rules Apply to Your Result?

October 5, 2026
8 Min Read

By HealthDataConsortium.org Research Team

Sources last checked October 6, 2026. Testing rules and marijuana policy can change, so confirm anything time-sensitive with the program that ordered your test.

The Short Answer

Whether a federal rule applies to your drug-test result depends on which program ordered the test. It does not depend on the drug, the lab, or the cup. A test run under U.S. Department of Transportation (DOT) rules follows DOT's procedures. A test run by a federal civilian agency follows that agency's program, which is built on HHS guidelines. A test required by an employer's own policy follows that policy and whatever laws apply to it.

The mistake to avoid is reading about one program's review rights and assuming they apply to yours. This guide gives you a way to identify your program using three things you can usually get in writing: the testing policy, the test form, and the person responsible for the program.

Program-Identification Decision Tree

Steps 1 and 2 gather clues. Work through steps 3 to 6 in order and stop at the first one that fits your situation. Step 7 applies to everyone.

  1. Gather three items. Find (1) the written testing policy or notice you were given, (2) the form from the collection site, and (3) the name and contact details of the person responsible for the program, such as a Medical Review Officer, HR contact, or program administrator. If you don't have one, ask for it in writing.
  2. Read the form as a clue, not a verdict. DOT requires employers to use the federal custody and control form for DOT-mandated tests and forbids using it in non-DOT programs (49 CFR §40.13). If you work for a private employer and were handed the federal form, ask whether the test is DOT-regulated. Mistakes happen: the FAA explains how to request a change when a federal form was wrongly used on a non-DOT test, and says a test on a safety-sensitive employee cannot simply be cancelled (FAA FAQ). If the paperwork and the policy disagree about what kind of test this is, ask the program contact to explain in writing.
  3. Ask: is my job a DOT-regulated safety-sensitive position? DOT's notice lists examples such as pilots, school bus drivers, truck drivers, train engineers and pipeline emergency response personnel (DOT marijuana notice).
    • Yes: you are on the DOT path (Path A below).
    • Not sure: use DOT's Am I Covered? tool. DOT says the tool is a guide and does not replace the regulations.
  4. Ask: am I a civilian employee of a federal executive-branch agency? If yes, you are on the federal-agency path (Path B).
  5. Ask: is my work covered by another federal safety program? Examples include Coast Guard testing of marine employers under 46 CFR Part 16 (Coast Guard bulletin) and Nuclear Regulatory Commission programs, which SAMHSA names as required by law to use the federal guidelines (SAMHSA FAQs). If yes, ask that program for its written procedures (Path C).
  6. None of the above? Your test is most likely governed by the policy of whoever ordered it, plus any laws that apply to that employer or program (Path D).
  7. Write it down. Record the program name, the policy document, the contact person, and the date and time you were notified of any result. Some deadlines run from notification.

What Each Path Means for Review Questions

Path A: DOT-regulated test

  • The procedures come from 49 CFR Part 40, plus the rules of your DOT agency (see DOT's agency information page).
  • A Medical Review Officer (MRO) is a licensed physician who receives and reviews laboratory results and evaluates medical explanations for certain results (DOT MRO page).
  • After an MRO notifies you of a verified positive result, or a refusal to test because of adulteration or substitution, you have 72 hours to ask the MRO for a split-specimen test. You can request a split-specimen test verbally or in writing, and you cannot request split-specimen testing for an invalid result. If you miss the window, the MRO can still direct a split test when the MRO concludes a legitimate reason, such as serious illness or not receiving notice, prevented a timely request (49 CFR §40.171).
  • DOT also publishes separate notices on medical marijuana, recreational marijuana, and CBD. Read the current versions on DOT's site instead of relying on summaries.

Path B: Federal civilian agency test

  • SAMHSA says the HHS Mandatory Guidelines give the scientific and technical structure for testing civilian employees in executive-branch agencies. It also says the guidelines do not address fitness for duty (SAMHSA FAQs). What happens after a result is a matter for your agency's policy.
  • The 72-hour figure above comes from DOT's rule. Do not assume it applies to a federal agency program. Ask for the agency's written procedure and deadlines, using the contact named in your notice or policy.

Path C: Another federal program

  • Coast Guard Part 16 testing must be kept completely separate from a marine employer's other testing, and the federal form is reserved for Part 16 tests (Coast Guard bulletin).
  • For this and similar programs, the regulation and the program contact answer the review question. A general article cannot.

Path D: Employer policy or other non-federal program

  • SAMHSA states that the federal guidelines do not cover non-federal employees, except agencies that are required by law to use them (SAMHSA FAQs). Do not assume a federal result-review rule applies to an ordinary employer test.
  • Whatever review exists comes from the written policy and applicable law. Ask whether a second test is available, who reviews a disputed result, whether a physician reviewer is used, and what the deadlines are.
  • State laws vary widely. SAMHSA keeps a page on state laws and regulations for employers. If your employer is a federal contractor or grantee, SAMHSA also has a page for contractors and grantees. Ask which requirements, if any, apply to you.

One Employer, Two Kinds of Tests

The same employer can run both. DOT's rule says DOT tests must be completely separate from non-DOT tests in all respects, and no one may change or disregard a DOT result based on a non-DOT result (49 CFR §40.13). If you are in a DOT-regulated job and also face a company-policy test, identify each test separately. The review rules for one do not carry over to the other.

A Moving Piece: Marijuana Rescheduling

DOT's notice says marijuana remains a Schedule I drug until rescheduling is complete, and that its testing regulations are unchanged until then. The page displayed a last-updated date of December 19, 2025, so check it for newer wording (DOT notice). Since then, a DEA order has moved only FDA-approved marijuana products and marijuana under a state medical license to Schedule III (Gibson Dunn summary). A law-firm analysis from September 2026 describes the broader proposal as still pending (Morgan Lewis analysis). Because this is changing, confirm the current status with DOT and DEA before relying on any summary, including this one.

Limits of This Article

Who Should Get Professional Advice

  • An employment attorney can help if you face discipline, loss of a job offer, or a dispute about whether the correct program rules were followed.
  • The program's MRO or reviewing clinician is the right contact for questions about medical explanations for a result.
  • Your own prescriber or pharmacist can answer questions about medicines. Do not stop or change a prescribed medicine on your own because of a drug test.

What to Do Next

  • Ask in writing for the testing policy and the name of the person who handles result reviews.
  • Note the date and time you were told about any result, and check the deadline for any second-test request.
  • If you may be DOT-covered, use Am I Covered? and read the rule for your DOT agency.
  • If the program is not federal, ask what review rights the policy gives you, and check your state's rules or speak with an attorney.

Sources

HealthDataConsortium.org is an independent publication. It is not a medical practice, a government agency, or the operator of any testing program, and it is not affiliated with SAMHSA, DOT or any former organization that used this domain. Its contributors are researchers, not licensed clinicians. See our Editorial Standards and Medical Disclaimer.

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