Drug testing is a practice that has been around for several decades. It is used to detect the presence of drugs in a person's system, typically for employment or legal purposes.

The first drug tests were developed in the 1960s and were used primarily to test soldiers and pilots for drug use. These early tests were not very reliable and often produced false positives.

In the 1970s, drug testing became more widespread and was used by employers to screen job applicants for drug use. In the 1980s, drug testing became more common in the sports world, as organizations began testing athletes for performance-enhancing drugs.

Over time, drug testing has become more sophisticated and accurate. Today, there are many different types of drug tests, including urine tests, hair tests, and saliva tests. These tests are used in a variety of settings, including workplaces, schools, and sports organizations.