Drug testing is a process used to detect the presence of illegal substances or prescription medications in a person's system. This testing can be conducted through various methods, including urine, blood, saliva, or hair samples. It is commonly used in workplaces, sports, and legal situations to ensure safety and compliance with regulations. The results of drug tests can help identify substance abuse issues and guide treatment options. Depending on the context, positive results may lead to disciplinary actions, rehabilitation programs, or legal consequences. Overall, drug testing aims to promote health and safety in various environments.