The practice of testing hair for evidence of drug abuse is an essential tool in the field of family law. If a person uses illicit drugs, it leaves tell-tale chemical signals in their hair follicles. The average person's head hair grows about 1 cm per month - so a few centimetres of hair can reveal a timeline of drug mis-use. The accuracy of the drug test depends on the way the samples are collected and the testing procedure used in the laboratory. An accredited lab can provide test results that will stand up in a court of law.
There is an excellent article on the Cheshire & North Wales Law Society website that delves into more detail and answers common questions about hair drug testing. You can read the full guide here.
Did you know?
- Hair can also be tested for evidence of excessive alcohol consumption
- If a person has little or no head hair, scientists can sometimes uses beard, body or underarm hair instead (although the growth rates and timelines are a little different)
- Drug & alcohol abuse can also be detected using a sample of blood, urine or even fingernails!
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