How does Hair Testing compare to urinalysis?
The primary differences are 1) wider window of detection 2) inability to tamper with the test Cocaine, methamphetamine, opiates and PCP are rapidly excreted and usually undetectable in urine 72 hours after use. The detection period for hair is limited only by the length of the hair sample and is approximately 90 days for a standard screen. At this time there are no known adulterants for hair tests. Since hair tests analyze the drugs inside the hair shaft, external contaminants/chemicals have no effect. Additional advantages include non-intrusive collection procedures, virtual elimination of test evasion; greater accuracy through test repetition capability. The combination of an increased window of detection and resistance to evasion makes Hair Testing far more effective than urinalysis in correctly identifying drug users.
