True hair follicle testing requires the hair be “plucked” rather than cut which can lead to extreme donor discomfort. During a hair drug test collection, the hair is cut as close to the scalp as possible, only the hair above the scalp is tested, not the follicle. The hair follicle is the pocket, below the scalp, from which the hair strand grows. Yes, calling a hair drug test a hair follicle drug test is a common misnomer, according to Jarod Rowland, a scientific expert in our Lenexa, Kansas hair drug testing laboratory. Is there a difference between hair drug testing and hair follicle drug testing? Hair testing collections are observed, meaning a collection can only be performed at a collection site, and performed by a collector, therefore reducing the likelihood of tampering or adulteration by a donor. When there was an effect, screening absorbance readings became more negative for positive hair specimens, and slightly more negative for the negative samples.
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