Montana cannabis employment and drug testing law
Off-duty use protected. Marijuana counts as a lawful product, so employers generally can’t refuse to hire or discriminate over legal off-premises use during nonworking hours. Status: Off-duty use protected — State law limits adverse action over lawful, off-duty cannabis use, with exceptions.
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Key Takeaways
- Status: Off-duty use protected — State law limits adverse action over lawful, off-duty cannabis use, with exceptions.
- Main source: MCA 39-2-313.
- Federal testing rules (DOT and federal workplace programs) apply regardless of state law.
What the law protects
- MCA 39-2-313 defines “lawful product” to include marijuana and bars an employer from refusing to employ, or discriminating against, someone for legal use of a lawful product off the premises during nonworking hours.
Exceptions and limits
- Use that affects the person’s ability to perform job-related duties or the safety of others, or that conflicts with a bona fide occupational qualification, is not protected.
- The section does not apply to personal service contracts, to nonprofits that discourage use as part of their mission, or to actions an employer believes are permissible under an established substance abuse policy, professional contract, or collective bargaining agreement.
Drug testing rules
- This section does not itself regulate drug testing procedures.
Notes and history
- Marijuana was added to the definition of lawful product in 2021 (ch. 576).
Federal law and testing
Federal rules still apply. Under the U.S. DOT’s testing rules, a Medical Review Officer must not verify a test as negative because a physician recommended a Schedule I drug under a state “medical marijuana” law, and must not accept use of hemp or other non-prescription marijuana-related products as an explanation (49 CFR § 40.151(e)–(f)). That covers safety-sensitive transportation workers regardless of state law.
Federal workplace drug testing programs follow HHS Mandatory Guidelines, which set the cannabis testing panel and cutoffs for urine and oral fluid (Federal Register, March 13, 2026). Most state protections above include an exception where federal law, a federal contract, or federal funding requires otherwise.
For how long cannabis can show up on each test type, see our drug testing guide and the detection window explainer.
Common questions
Can you be fired for using cannabis in Montana?
Montana law (MCA 39-2-313) limits adverse action over lawful off-duty cannabis use, but it has exceptions — including impairment or use at work, federally regulated or funded jobs, and specific positions listed in the statute. It is not a blanket protection.
Can Montana employers still drug test for THC?
Testing is limited in some situations but not banned outright. Read the testing section above for what MCA 39-2-313 allows, and remember that federally required tests (for example DOT-regulated jobs) are unaffected.
Does Montana law protect CDL drivers or federal workers?
No state law overrides federal testing rules. DOT-regulated employees remain subject to federal cannabis testing, and a state medical recommendation is not an accepted explanation for a positive result.
Sources
- government Montana Code Annotated 39-2-313, Discrimination against employee for use of lawful product (Montana Legislature) ↗ accessed 2026-10-03
- government eCFR, 49 CFR § 40.151 — What are MROs prohibited from doing as part of the verification process? (U.S. DOT) ↗ accessed 2026-10-03
- government Federal Register, Mandatory Guidelines for Federal Workplace Drug Testing Programs: Authorized Testing Panels (March 13, 2026) ↗ accessed 2026-10-03