When Can Your Employer Drug Test You in San Diego?

By Eugene Bruno on June 30, 2026

Drug testing in the workplace has become one of the most controversial employment law issues in California. With changing marijuana laws and evolving workplace protections, many workers are unsure where the line is between a lawful workplace drug testing policy and a violation of employee rights.

The San Diego labor law attorney at Eugene Bruno & Associates helps employees understand their legal rights under California employment law. If you are facing disciplinary action, termination, or invasive workplace practices related to drug testing, we can clarify your legal options and fight to protect your rights.

Understanding Reasonable Suspicion Drug Testing

In California, employers generally cannot conduct random drug testing of current employees unless there is a strong business justification or a safety-sensitive position is involved.

Many employers rely on a “reasonable suspicion” policy to justify drug testing. Reasonable suspicion refers to a situation where an employer points to allegedly objective facts suggesting an employee may be under the influence of drugs or alcohol while working.

California law requires employers to act carefully when making these determinations. Employers cannot rely on rumors, stereotypes, or personal bias. They must be able to point to specific observations or conduct that justify testing.

Examples of possible evidence that may be used to justify reasonable suspicion drug testing include:

• Slurred speech
• Bloodshot eyes
• The smell of alcohol or marijuana
• Erratic or aggressive behavior
• Significant decline in work performance
• Confusion or disorientation
• Unsafe conduct on the job
• Involvement in a workplace accident

Employers Must Document Reasonable Suspicion

One of the most important legal protections for workers is the requirement that employers properly document the basis for testing. Before requiring a drug test, supervisors should carefully record:

• Specific behaviors observed
• The date and time of incidents
• Witness statements
• Workplace safety concerns
• Performance issues
• Any workplace accidents or near misses

Courts are often skeptical of broad or arbitrary testing policies that invade employee privacy without sufficient justification. Employers who cannot explain why testing was ordered may struggle to defend their actions in court.

An experienced employment lawyer can evaluate whether an employer followed lawful procedures or violated employee rights during the testing process.

California Employee Drug Testing Laws and Privacy Rights

California has some of the strongest employee privacy protections in the country. The California Constitution recognizes privacy as a fundamental right, which directly affects workplace drug testing policies.

Because drug tests can reveal highly personal information, courts have repeatedly held that employers must balance their business interests against an employee’s privacy rights.

Under California employee drug testing laws, employers generally have more freedom to test:

• Job applicants before hiring
• Employees in safety-sensitive positions
• Workers following workplace accidents
• Employees, when there is documented reasonable suspicion

California Law and Off-Duty Marijuana Use

Beginning January 1, 2024, California Assembly Bill 2188 expanded protections for employees who use marijuana off duty and away from the workplace. Under the law, most employers cannot discriminate against employees based solely on:

• Off-duty cannabis use
• Positive tests detecting cannabis metabolites

Can You Refuse a Workplace Drug Test?

Employees may refuse a drug test, but doing so may carry serious consequences depending on workplace policies and the circumstances. Some employers treat refusal as insubordination, a violation of company policy, or grounds for suspension or termination.

Determining if discipline is lawful depends on several factors, including:

• Whether the employer had a legitimate, reasonable suspicion
• Whether the testing policy was clearly communicated
• Whether the policy complies with California law
• Whether the employee was singled out unfairly

What Happens After a Positive Drug Test?

A positive drug test does not automatically mean termination is lawful. Employers still must comply with California employment laws, anti-discrimination protections, and workplace procedures.

Several important legal questions may arise after a positive test:

• Was the employee actually impaired at work?
• Was the test accurate and reliable?
• Did the employer follow proper procedures?
• Does the employee have a protected medical condition?
• Was the testing policy applied consistently?

When Drug Testing Leads to a Wrongful Termination Claim

Wrongful termination cases often arise when employers overstep legal boundaries or fail to respect employee rights. Potentially unlawful situations may include:

• Testing based on rumors alone
• Selective enforcement targeting certain employees
• Retaliatory testing after complaints or whistleblowing
• Discrimination based on disability or medical treatment
• Punishment for lawful off-duty cannabis use
• Failure to follow company policies
• Invasion of employee privacy

California courts take employee privacy seriously, particularly where testing appears arbitrary or abusive. For example, if an employer suddenly orders a drug test after an employee reports harassment, files a wage complaint, or requests medical leave, the timing may raise concerns about retaliation.

What Employees Should Do if They Are Asked to Take a Drug Test

If your employer requests a drug test, it is important to stay calm and carefully document the situation. Many employees unknowingly waive important protections by signing documents or making admissions before understanding the legal implications.

To protect your rights, you will want to:

• Request a copy of the workplace drug testing policy
• Ask why the test is being required
• Document conversations with supervisors
• Record the names of witnesses
• Keep copies of disciplinary notices or emails
• Consult an employment lawyer before signing documents

Speak With a Trusted San Diego Labor Law Attorney

At Eugene Bruno & Associates, we represent employees throughout San Diego who are facing unfair workplace treatment related to drug testing policies, disciplinary action, or termination. Our firm works to hold employers accountable when they violate employee rights or misuse workplace policies.

Eugene Bruno & Associates has helped over 5,000 satisfied clients and holds an A Rating from the Better Business Bureau.

Call 1-888-BRUNO-88 (1-888-278-6688) to schedule a free consultation today.

Frequently Asked Questions About Workplace Drug Testing in San Diego

Can my employer drug test me without warning in California?

In most cases, California employers cannot randomly drug test current employees unless the position is safety-sensitive or the employer has a strong justification.

What qualifies as reasonable suspicion for workplace drug testing?

The reasonable suspicion definition workplace policies commonly use includes observable signs such as slurred speech, erratic behavior, confusion, unsafe conduct, the smell of drugs or alcohol, or involvement in a workplace accident.

Can I be fired for using marijuana off the clock in California?

Under recent California employee drug testing laws, including AB 2188, many employees are protected from discrimination based solely on lawful off-duty marijuana use.

Can I refuse a workplace drug test?

You may refuse a drug test, but your employer could impose disciplinary action depending on the company’s workplace drug testing policy and the circumstances involved. If the employer lacked reasonable suspicion or violated an employee’s rights during drug testing, disciplinary action, or termination may be challenged.

What should I do if I believe I was wrongfully terminated after a drug test?

If you believe your employer violated California law or used drug testing as a pretext for retaliation or discrimination, you should speak with an employment lawyer as soon as possible by calling 1-888-BRUNO-88 (1-888-278-6688).