Legal Marijuana & Workplace Rules

Many states allow medical or adult-use marijuana, but that does not mean you can use it and keep any job. Federal law, employer policies and safety rules still apply, and the rules differ widely from place to place.

• All Workers
• Drivers
• Employers

The basics

• Federal law: marijuana remains a controlled substance under federal law, though its legal classification has been under review. Federal rules and contracts that require drug-free workplaces still apply.
• State law: varies. Some states protect off-duty lawful use or medical patients from adverse action in some jobs. Others let employers fire or refuse to hire for any positive test. Check your state's law and agency.
• Employer policies: most employers may prohibit use, possession or impairment at work, and many test. Policies must be applied fairly and as the law allows. See Drug Testing.

Safety-sensitive and regulated jobs

• DOT-regulated workers (commercial drivers, pipeline, rail, aviation and others) are tested for marijuana under federal rules, and a positive test is a violation even with a state medical card. See Drug & Alcohol Testing.
• Construction and industrial employers often have zero-tolerance policies because of equipment and heights.
• Employers can send an impaired worker home for safety. See Fitness for Duty.

Testing challenges

• Common tests detect metabolites that remain in the body for days or weeks, so a positive test does not prove you were impaired at work.
• There is no widely accepted roadside-style impairment test like the breathalyzer for alcohol.
• CBD products may contain traces of THC and can cause a positive test.

Medical use and accommodation

Some state laws protect medical marijuana patients. Under federal disability law, an employer is not required to allow marijuana use as an accommodation. If you have a medical condition, you may ask about other accommodations. See Disability Accommodations.

What you should do

• Read your employer's drug and alcohol policy and handbook
• Know whether your job is covered by DOT, federal contract or union rules
• Do not use or bring marijuana to work or into company vehicles
• If you are tested, ask for a copy of the policy and the testing procedure, and your right to a retest if allowed
• If you are fired or disciplined and think it was unlawful, contact your state labor or civil rights agency. See Wrongful Termination
• If you struggle with substance use, help is available. See Substance Use & Recovery

Last updated: October 8, 2026