Longer Detection Window
A hair follicle drug test will return twice the number of positives as compared to a standard urine drug test. Urine drug tests can detect drug use within 2-4 days of use for most drugs. Hair drug tests can detect a pattern of repetitive drug use for up to 90 days.
Hair follicle drug tests are very difficult to cheat primarily because of the way samples are collected. During a hair collection, the collector will cut hair from the donor’s head. The hair is cut as close to the scalp as possible and, in most cases, the result is not visible to others. Many donors find a hair collection less awkward for the donor than urinating into a cup. It also eliminates the opportunity to cheat a drug test by using fake/synthetic urine, dilution or any other trick. Body hair may also be used.
Because of the longer detection window, hair drug tests are ideal for random or pre-employment drug tests where you’d like to detect habitual drug use or addiction, whereas a urine drug test or oral fluid drug test is well-suited for reasonable suspicion or post-accident drug testing to detect current or very recent use of drugs.