Drug testing unrelated to the reporting of a work-related injury or illness.
Drug testing under a state workers’ compensation law.
Drug testing under other federal law, such as a U.S. Department of Transportation rule.
Drug testing to evaluate the root cause of a workplace incident that harmed or could have harmed employees. If the employer chooses to use drug testing to investigate the incident, the employer should test all employees whose conduct could have contributed to the incident, not just employees