| Description: | While hair follicle tests are less common than urinary, saliva or blood-based tests, they can generally detect a wider range of drugs as well as being more effective and of course also have a longer detection window. Like any drug screen however, it is still not 100% effective. Factors including a person’s average rate of sweat, the nature of the drug compounds present in the hair sample and the level of melanin in an individual’s hair sample can all play a role in how likely the test is to pick up a drug substance. Hair follicle tests can not only detect marijuana but also substances such as amphetamines (such as ecstasy), opiates, cocaine and PCP. |
