No, only a small hair sample is needed, and it doesn’t have to include the roots. Hair drug testing typically requires about 3 cm of hair cut close to the scalp — around 100 to 120 strands, or roughly the width of a pencil. This small sample size means the test is discreet and won’t leave bald spots. Also, the hair is cut, not pulled out, so the process is painless.
Is a large section of hair required to conduct hair drug testing and does it need to include roots?
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