Drug testing is a process used to detect the presence of illegal substances or prescription medications in a person's system. This can be done through various methods, including urine, blood, saliva, or hair tests. Drug tests are 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. They are also used to maintain fair competition in sports and to ensure that employees are fit for duty. Overall, drug testing plays a crucial role in promoting health and safety in various environments.