Cannabis and Your Job: Drug Tests and State Protections in 2026

Marijuana is now the substance most often behind a positive workplace drug test. Quest Diagnostics' 2026 Drug Testing Index found marijuana positivity of 4.4% in urine tests of the general US workforce in 2025, 11.1% in oral fluid and 15.1% in hair. Hair-test positivity for marijuana rose from 9.5% in 2021.

At the same time, more states have stopped letting employers treat a THC metabolite as proof of anything. This guide sorts out who is protected, who is not, and what to do before a test. It is not legal advice.

Federal law

No protection for adult-use; DOT still tests

States limiting pre-hire THC tests

CA, NY, WA, NV, MN (with exceptions)

Always excluded

Safety-sensitive, federal and DOT roles

Impairment on the job

Never protected

Newest law

Maryland fire and rescue, October 1, 2026

Can you be fired for using cannabis legally?

In most states, yes, unless a specific state law says otherwise. Legalization laws usually let employers keep drug-free workplace policies.

The states that go further take one of three approaches: banning or limiting pre-employment cannabis tests, protecting lawful off-duty use in general, or protecting registered medical patients. Every one of them lets employers discipline someone who is impaired at work, and none overrides federal testing rules.

Other states, including New Jersey, Connecticut, Rhode Island, Montana and the District of Columbia, have their own off-duty or patient protections, and Arizona, Missouri, Oklahoma and Delaware protect registered medical patients in various ways. Read your state's statute or your employer's policy for the details that apply to your job.

What changed in 2025 and 2026?

The biggest federal change in years happened in April 2026, but it did not change workplace testing.

1. 2025

   More states add impairment-based standards; employers with staff in several states adjust policies to the strictest rules, according to employment-law firms.

2. 2026-04-28

   A federal order places state-licensed medical marijuana and FDA-approved marijuana products in Schedule III. Adult-use marijuana stays in Schedule I.

3. 2026-04

   Maryland's governor signs the fire and rescue medical cannabis protection (SB 439).

4. 2026-06-29

   A DEA administrative hearing on broader rescheduling begins; a decision is still pending.

5. 2026-10-01

   Maryland's protection for firefighters, EMTs and paramedics takes effect.

Does Schedule III change DOT drug tests?

No, as far as DOT has published. In February 2026 DOT said its testing process and 49 CFR Part 40 would not change until rescheduling is complete, and that marijuana remains prohibited for safety-sensitive transportation workers. We found no later DOT change on its drug and alcohol office pages in September 2026.

That covers truck and bus drivers, pilots, train crews, pipeline workers and others under DOT rules. Medical review officers may not treat a confirmed marijuana positive as negative because the worker has a state medical card, a dispensary receipt or a doctor's recommendation. DOT has said it is following the rescheduling process and will update the transportation industry as changes occur.

Why a positive test doesn't prove impairment

Standard tests look for THC metabolites that can stay in the body for weeks after use, long after any effect has worn off.

That is the reasoning behind California's law. The Legislature distinguished non-psychoactive metabolites, which show only past use, from THC itself, which may indicate recent use. Employers there can still use tests that don't screen for non-psychoactive metabolites, such as some oral fluid tests, and can act on signs of impairment. Illinois law goes a step further and lists observable signs employers may rely on when they claim impairment.

Before a drug test: a practical checklist

Know your rules before you are asked to test, not after.

• Read the written policy — look for the drug-testing section of the handbook or offer letter, including which test type is used.
• Check whether your job is safety-sensitive or federally regulated — if it is, state protections probably do not apply.
• Look up your state statute — the table above gives the law names to search.
• Don't volunteer more than asked — California employers may not ask applicants about past cannabis use.
• Avoid hemp "THC-free" assumptions — hemp products, THCA flower and delta-8 can all produce a positive result; see our THCA explainer.
• Get advice if disciplined — state labor departments and employment lawyers can say whether a protection applies.

Medical patients should also know what their card does and does not do; our medical card guide covers the benefits, and state-specific rules are on hubs such as California and New York.

After a positive test: what to do next

Act quickly, because some protections come with short deadlines.

1. Ask which test was used and what it found
   A result for a metabolite is different from one for THC itself, and that difference decides the outcome under California's law.
2. Use any retest right
   Nevada gives employees tested in their first 30 days the right to rebut a positive result with a second test at their own expense.
3. Talk to the medical review officer
   For regulated tests the MRO contacts you before reporting. Mention prescriptions honestly; for DOT tests a state medical card will not change the result.
4. Put your questions in writing
   Ask HR which policy and which law they relied on. Keep copies of the policy, the offer letter and any messages.
5. Contact your state labor agency or a lawyer
   If you are in a protected state and not in an excluded job, a complaint or claim may be possible.