Hair test for drugs is a noun which refers to a type of drug test that utilizes an individual's hair to detect the presence of drugs. For example, a hair test can be used to detect drug and alcohol use over the last 90 days.
Hair tests are relevant because unlike urine tests, hair tests can detect drug use over a longer period of time. They are also beneficial in situations where urine is not available or where adulteration of urine is suspected. A key historical development in hair testing was the development of the enzyme-linked immunosorbent assay (ELISA) in the 1970s, which made it possible to detect drugs in hair samples.




