Our hair testing detects nearly twice the number of positives as our urine test. Unlike urine drug testing, which may only detect drug use within the past 2-3 days, hair testing is able to detect a pattern of repetitive drug use for up to 90 days. While urine testing is well suited to detect recent drug use for post-accident or reasonable suspicion testing, a hair test is the most effective way to evaluate long-term patterns of use, making it an excellent option for a pre-employment or random testing program.