If you learn that a coworker is a substance abuser, what is the appropriate action?

Reporting the situation to your supervisor is the appropriate action because it ensures that professionals who are trained to handle such issues can address the potential risks associated with substance abuse in the workplace. This action supports the safety and well-being of all employees by allowing the organization to take informed steps to manage the situation effectively. It also helps to maintain confidentiality and protects the coworker from potential harm that could arise from being confronted directly or discussed informally with others. By involving a supervisor or human resources, you are following proper protocols and encouraging a healthy work environment.