California — drug testing employment law

What are the drug testing laws in California?

California's workplace testing posture is substantively restrictive. Adult-use cannabis is legal in California (since 2016). Off-duty cannabis use receives strong off-duty protection; medical cannabis patients have express mmj employee protection. The detail and exceptions matter — read below before adopting or contesting a policy.

At a glance: California

Overview: drug testing in California

California has the most worker-protective cannabis testing regime in the country. As of January 1, 2024, AB 2188 (codified at Cal. Gov. Code § 12954) makes it unlawful for an employer to discriminate against a person in hiring, termination, or any other term or condition of employment based on a person's use of cannabis off the job and away from the workplace, or based on an employer-administered drug test that detects non-psychoactive cannabis metabolites. SB 700 (effective January 1, 2024) extends the protection by prohibiting employers from asking applicants about prior cannabis use.

Cannabis law and workplace testing

California employers may not test for non-psychoactive cannabis metabolites (THC-COOH) as a hiring or employment-decision criterion for non-exempt roles. Permitted tests include those that identify only psychoactive cannabis components (e.g., oral fluid for active THC), tests for impairment, and tests required for federal-contract, federal-funding, building/construction trades, or safety-sensitive roles defined by state or federal law. The carve-outs are narrow and statute-specific.

Specific testing rules in California

The table below summarizes how California typically treats four common workplace testing scenarios. Each row reflects the dominant statutory or case-law position; carve-outs (federal-contractor, DOT-regulated, safety-sensitive, etc.) may shift any individual analysis.

Federal overlay: DOT and federal contractors

In all U.S. states — including California — DOT-regulated employees (safety-sensitive roles in transportation industries under 49 CFR Part 40) and federal-contractor employees subject to the federal Drug-Free Workplace Act of 1988 are testable under federal rules regardless of state cannabis status or workplace-testing restrictions. State law cannot reduce federal testing obligations for these populations. Where state law otherwise restricts cannabis testing, the federal-overlay carve-out typically preserves the employer's authority for these federally affected roles.

For employers in California

Revisit pre-employment and routine testing programs. Replace urinalysis-based cannabis screening with oral-fluid or impairment-based testing where federal/contract obligations don't mandate urine. Document safety-sensitive role designations and consult counsel before terminating any non-exempt employee for cannabis metabolite. DOT, federal-contractor, and building/construction trade carve-outs remain.

• Written policy. Document the substances tested, the cutoff levels, the testing modalities (urine / oral fluid / hair), and the consequences of a non-negative result.
• Notice. Provide written notice before testing begins and obtain signed acknowledgement where the state requires it.
• Certified laboratory. Use a SAMHSA-certified or equivalent laboratory; document chain of custody.
• Confirmation testing. Confirm any non-negative initial result with mass-spectrometry (GC-MS or LC-MS/MS) before any adverse action.
• MRO review. Engage a qualified Medical Review Officer to review all non-negative results before reporting to the employer.
• Safety-sensitive designations. If the role is statutorily exempt as safety-sensitive, document the designation in writing using the state\'s statutory definition.
• Medical cannabis disclosures. Where state law provides patient protection, engage an interactive accommodation process before adverse action.

For workers in California

You generally cannot be denied employment or terminated based on off-duty cannabis use alone, and you cannot be asked about prior cannabis use as an applicant. The protection does not apply if you bring cannabis to work or are impaired on the job, or if your role is DOT-regulated, federal-contractor-covered, building/construction trade, or otherwise statutorily exempted.

• Know the policy. Request a copy of your employer\'s written testing policy — it should specify when testing occurs, what is tested, and how to challenge a result.
• Disclose medications to the MRO, not the employer. The Medical Review Officer reviews non-negative results before they are reported and can resolve a legitimate prescription explanation.
• Document medical cannabis status. If you are a registered medical cannabis patient in a state with patient protection, document your status with HR before testing.
• Confirmation testing. Any non-negative initial result should be confirmed by GC-MS or LC-MS/MS before adverse action.
• Appeal rights. Many state statutes provide an appeals process — read your employer\'s policy carefully.

Recent developments in California

AB 2188 and SB 700 reshape California cannabis testing from January 2024. Litigation interpreting the carve-outs (federal-contractor, building/construction trade, safety-sensitive) is unfolding. Employers operating across multiple states should redesign cannabis policies on a California-specific basis rather than apply a national template.

Key statutes and citations

The following statutory citations are the primary controlling authority for drug testing employment law in California. We provide citations only — confirm current text via your state legislature\'s codified statutes (or an authoritative legal research platform) before relying on this information.

• FEHA cannabis amendments (AB 2188) — Cal. Gov. Code § 12954
• SB 700 (medical cannabis use disclosure protection) — Cal. Gov. Code § 12954(b)
• Adult Use of Marijuana Act — Health & Saf. Code § 11362.45
• Compassionate Use Act of 1996 — Health & Saf. Code § 11362.5

Multi-state employers operating in California

A national or multi-state employer\'s policy that works in a permissive state (e.g., Alabama or Texas) may not be lawful as applied to employees in California, and vice versa. Common multi-state pitfalls include: applying a national pre-employment cannabis screen in jurisdictions that prohibit it; treating a positive cannabis test as automatic disqualification where state law restricts that outcome; failing to designate safety-sensitive roles in compliance with the relevant state\'s statutory definition; and not maintaining state-specific written policies and acknowledgements. For multi-state programs, see our multi-state employer guide.

How this page is built and reviewed

This page combines a structured data layer (cannabis status, statutory protection levels, voluntary program details, statute citations) with state-specific narrative drafted from primary statutes and authoritative secondary sources. Every claim should trace either to a statute citation, an authoritative secondary source (e.g., NCSL, EEOC, DOT, SHRM, ASAM), or general background knowledge clearly framed as such. The page is reviewed against the listed sources on each material amendment.

Found something out of date? Let us know — we update state pages as statutes and case law evolve.