Sunday, February 5, 2023

Employers Should Have Reasonable Suspicion for Drug Testing Workers


Can I drug test my employee who is acting strangely and not answering questions correctly? His behavior is very suspicious.

Every California employer can require pre-employment drug testing as one of the last steps in the hiring process. Once someone is an employee, however, he/she has a higher expectation of privacy.

Reasonable Suspicion

Employers may conduct “reasonable suspicion” drug testing, but this is a delicate area and observations that “Joe is acting weird” do not substantiate such a test.

Reasonable suspicion means that the employer has a genuine reason to believe that an employee has been taking drugs. This reason should be based on facts, knowledge, and logic. It should not be a guess, nor should it be based on a report from another employee who perhaps has reason to get “Joe” in trouble. It is best to have supervisors trained in the signs of usage.

Examples of usage are different for different drugs, but some indications include:

• Bloodshot eyes, pupils larger or smaller than usual;

• Changes in appetite or sleep patterns;

• Changes in work performance;

• Sudden weight loss or weight gain;

• Deterioration of physical appearance, personal grooming habits;

• Unusual smells on breath, body or clothing; and/or

• Tremors, slurred speech, or impaired coordination.

The signs of usage, however, vary with the drug, and the indications noted above are far from exhaustive. Certain testing clinics will conduct classes, and the Internet provides information on many levels. Knowledge is key.

Drug Testing

Also, escorting the employee to be tested is critical if you think he/she is under the influence. Further, the employee may have a medical condition and the first concern should be for the health of the employee.

Last, the employer must have a stated policy that a reasonable suspicion drug testing will be conducted if the employer thinks an employee is using drugs. As noted earlier, current employees have an expectation of privacy. The policy supersedes this expectation.

The Labor Law Helpline is a service to California Chamber of Commerce preferred and executive members. For expert explanations of labor laws and Cal/OSHA regulations, not legal counsel for specific situations, call (800) 348-2262 or submit your question at

Staff Contact: Dana Leisinger

Dana Leisinger
Dana Leisinger
Dana Leisinger joined the CalChamber in 2000 and currently serves as an HR adviser. She has advised employers on matters such as employment law, wrongful termination, discrimination, sexual harassment and wage and hour issues. She also has conducted seminars and training and guided employers through various levels of governmental investigations. Leisinger holds a J.D. from the McGeorge School of Law, University of the Pacific.

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