HAIR FOLLICLE drug test can detect drug use for a period of 90 days or longer depending on the length of the hair being tested. Hair follicle drug testing are being used more and more because of the wider detection window and inability to tamper with the actual test. This drug testing option is much more effective then the standard urinalysis drug test. This test will detect the most common street drugs used by drug users and OPIATES found in most prescription medications.