Can Employers Test for Cannabis? US Law Guide

Yes, in most US states. No federal law bars a private employer from requiring a cannabis test. State law sets the limits, and a list of states restricts pre-employment tests. Federal rules cover federal agencies, federal contractors and safety-sensitive transport jobs.

Workplace Cannabis Drug Screening: Everything You Need to Know with CBD

Federal rules

The Drug-Free Workplace Act of 1988 applies to federal contractors and grantees with contracts of $100,000 or more. It requires a written policy and a drug awareness program. It does not require drug testing.

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49 CFR Part 40 covers safety-sensitive transport workers: CDL drivers, pilots, rail crews, transit operators and pipeline workers. Marijuana stays on the DOT test panel. A state medical card or a state legalization law does not excuse a positive DOT result. Federal employees fall under Executive Order 12564.

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State limits on pre-employment tests

California: AB 2188 took effect Jan 1, 2024. It bars cannabis tests before hire and bars adverse action based on off-duty use. Exceptions include federal contractors, DOT positions, construction, health care and jobs that require a federal security clearance.

Nevada: AB 132 (2020) bars pre-employment cannabis screens. Exceptions cover safety-sensitive roles and federal contract compliance.

New York: Labor Law 201-d bars discrimination based on off-duty cannabis use. New York City adds local limits on pre-employment tests.

Other states added limits in 2023 and 2024, including Minnesota and Rhode Island. Statute text and effective dates differ. Check the state labor department and the statute itself.

What a test detects

Urine tests detect THC metabolites, not impairment. A single use can show for about 3 days. Daily use can show for up to 30 days. Hair tests detect use for up to 90 days. Oral fluid tests have a shorter window.

Hemp-derived CBD can trigger a positive on some screens. Confirmatory testing and a medical review officer reduce false results.

What employers can still do

Test after an accident, on reasonable suspicion, or at random where state law and a union contract allow it. Test for other drugs. Bar use and possession at work. Act on observed impairment.

Steps before a test

1. Read the state statute and any city ordinance.
2. Check the collective bargaining agreement.
3. Confirm which exemptions apply to the role.
4. Put the policy in writing and give notice.
5. Use a certified lab and a medical review officer.