Substance testing refers to the process of analyzing biological samples, such as urine, blood, or saliva, to detect the presence of drugs or alcohol. This testing is commonly used in various settings, including workplaces, schools, and law enforcement, to ensure safety and compliance with regulations. The tests can identify a range of substances, including marijuana, cocaine, opioids, and alcohol. Results can help organizations make informed decisions regarding employee health, safety, and legal compliance. Substance testing is often part of drug rehabilitation programs and can also be used in sports to ensure fair competition.