Understanding the Hair Drug Tests for Longer Detection Window Hair drug testing detects the presence of a drug and its metabolites in a person's hair. This test identifies the metabolites of drugs that enter the bloodstream and are carried to different body parts, including the hair. The test can tell what drugs a person has used in the past and for how long. Hair grows about 1 cm/month, and the drug hair test can detect drug use in a person for up to 12 months. At DNA Forensics Laboratory Pvt. Ltd., we specialize in conducting drug tests. Our tests provide a close-to-accurate assessment of an individual's drug use over an extended duration. Our hair drug tests are reasonable, and you can also order the Urine Home Drug Test Kit online. For further inquiries regarding our test charges, please contact us at +91 8010177771 or via WhatsApp at +91 9213177771. #drughairtest #hairdrugtesrting