Can You Be Fired for Smoking Weed in California? What Employees Should Know

In California, an employer generally cannot fire or refuse to hire someone solely because the person used cannabis away from work or has certain cannabis-use metabolites in a drug test. But that protection is not a blanket right to use marijuana whenever or wherever an employee chooses. Employers can still enforce workplace rules against cannabis use, possession, and impairment, and some jobs are exempt from the state protections. The outcome depends on when and where cannabis was used, the job involved, and what the test actually measures.

California’s Cannabis Employment Protections

California Assembly Bill 2188 changed state employment law effective January 1, 2026. It generally bars employers from discriminating against a person in hiring, termination, or other employment decisions based on cannabis use away from the workplace and away from work hours. It also restricts employers from relying on certain drug-test results that detect nonpsychoactive cannabis metabolites rather than current impairment.

The law reflects a distinction between past cannabis exposure and being impaired at work. Cannabis metabolites may remain detectable after the intoxicating effects have worn off. A positive result for those residual metabolites does not, by itself, establish that a person was impaired while working.

Senate Bill 700, also effective January 1, 2026, added a related protection: with limited exceptions, employers may not ask applicants about their prior cannabis use. Together, the laws offer protections in hiring and employment decisions, but they do not require employers to allow cannabis use or impairment on the job.

When Can an Employee Be Fired for Smoking Weed?

An employee can still face discipline or termination for cannabis-related conduct that violates a lawful workplace rule. California’s protections do not authorize an employee to use, possess, or be impaired by cannabis while working, on company premises, or during work hours. Employers may enforce rules that prohibit those activities.

For example, an employer may generally take action if an employee uses cannabis during a shift, brings cannabis to a worksite in violation of policy, or is impaired while performing job duties. Safety-sensitive work can make impairment especially consequential. The key issue is that an employment decision should not rest simply on lawful, off-duty cannabis use or a test result that reveals only lingering metabolites.

Whether a particular firing is lawful can depend on the employer’s policy, the evidence of workplace conduct or impairment, the testing method, the employee’s role, and whether an exception applies. A positive test alone does not automatically make a termination legal or illegal under every circumstance.

What California Law Says About Drug Testing

AB 2188 limits employers’ use of tests that detect nonpsychoactive cannabis metabolites. These are compounds that can remain in the body after cannabis’s intoxicating effects have ended. A test that identifies such metabolites may indicate prior exposure, but it generally cannot show exactly when cannabis was used or whether a person was impaired at the time of testing.

The law does not prohibit every kind of cannabis test. It allows employers to use scientifically valid testing methods that do not screen for those nonpsychoactive metabolites. The statute identifies tests that measure impairment or the presence of THC in bodily fluids as examples of methods that may be used, depending on the test and circumstances.

Testing technology and what a particular test can establish vary. Employees and employers should not assume that every test labeled “cannabis testing” measures current impairment. Employers should understand what their testing vendor’s method detects, and employees who receive an adverse decision may want to ask what test was used and what the result means.

California’s law also does not prevent employers from maintaining a drug-free workplace when required by state or federal law, regulation, or contract. In those situations, additional rules may control.

Exceptions to California’s Cannabis Protections

AB 2188 does not apply to every worker or position. The statute excludes employees in the building and construction trades. It also does not apply to applicants or employees hired for positions requiring a federal background investigation or security clearance under applicable law or regulations.

Other laws can also affect an employer’s obligations. Federal rules may require testing, prohibit cannabis use in certain roles, or impose conditions on employers receiving federal funding or contracts. For example, transportation workers in federally regulated safety-sensitive positions may be subject to federal drug-testing requirements. California’s state protections do not override conflicting federal requirements.

Employers may also have legal duties to maintain a drug-free workplace under particular contracts or regulations. The precise rule depends on the job and the law or agreement involved; a general reference to “federal law” does not automatically establish that every position is exempt.

Can an Employer Ask About Past Marijuana Use?

SB 700 generally prohibits employers from asking applicants about their prior cannabis use. It also prohibits using information about an applicant’s prior cannabis use obtained from a criminal history report, except where an exception applies. The law amended California’s Fair Employment and Housing Act and took effect on January 1, 2026.

This restriction concerns prior use, not all questions about workplace conduct or present ability to perform a job. Employers can still explain workplace rules and ask lawful questions about whether an applicant can meet job-related requirements. Special rules may apply where another law permits or requires the inquiry, including certain background checks or positions subject to federal requirements.

Applicants should answer questions honestly, but they do not generally have to volunteer past cannabis use in response to a question an employer is prohibited from asking. If a hiring decision appears to rely on information about prior use, the applicant may want to document what was asked, what was disclosed, and how the employer explained its decision.

Does a Medical Marijuana Card Protect an Employee?

A medical cannabis recommendation or card does not give an employee a general right to use cannabis at work or to be impaired while working. California’s Supreme Court ruled in Ross v. RagingWire Telecommunications, Inc. (2008) that the state’s medical-marijuana law did not require an employer to accommodate an employee’s off-duty medical cannabis use.

AB 2188 added protections for off-duty cannabis use and certain testing results, but it did not create a broad workplace accommodation requirement for medical cannabis. Employers may still enforce restrictions on workplace use and impairment, subject to applicable laws. An employee who needs workplace accommodation for a separate disability or medical condition may have rights under disability law, but that does not necessarily require an employer to permit cannabis use.

Because disability accommodation and cannabis rules can involve different legal questions, employees should describe the workplace limitation or accommodation they need without assuming that a cannabis card alone resolves the issue.

How to Respond to a Cannabis-Related Workplace Decision

An employee who is denied a job, disciplined, or fired after a cannabis test or disclosure should preserve relevant information. Helpful records may include the drug-testing notice, test result, employer policy, messages about the decision, the job description, and details about whether the employee was working or off duty when the alleged use occurred.

• Ask what the test measured. Find out whether it detected residual metabolites or used a method intended to assess current impairment.
• Review the written policy. Check when the policy was issued, what conduct it prohibits, and whether it identifies a testing method or legal exception.
• Identify the job-specific rules. Determine whether the position is in the building and construction trades, requires a federal background investigation or clearance, or is subject to federal testing rules.
• Keep communications and dates. Record when the test occurred, when the employer acted, and what reasons were given.
• Seek advice promptly. Employment claims can have filing deadlines. The California Civil Rights Department provides information about discrimination complaints, and an employment attorney can assess how the law applies to the facts.

A positive result does not necessarily prove impairment, but it also does not automatically prove that an employer violated the law. The testing method, the employee’s conduct, the applicable exception, and the employer’s stated reason all matter.

California Cannabis Employment Rules at a Glance

Where to Find Official Information

The California Legislature’s official texts provide the specific language of AB 2188 and SB 700. The California Civil Rights Department explains employment discrimination protections and complaint procedures. Federal workers and employees in regulated industries should also check the rules that apply to their specific role.

In short: California generally protects employees from being fired solely for lawful off-duty cannabis use or for a test that detects only lingering metabolites. Employers can still prohibit cannabis use and impairment at work, and statutory exceptions and federal requirements can change the result.