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Hair Drug Testing

Hair testing for drugs of abuse is the only drug testing method available that provides up to a 90-day drug use history. When compared with urine testing, hair testing provides nearly twice the number of positives due to its longer detection window.

Hair testing requires a small sample of hair that is collected under direct supervision without any invasion of privacy. During a hair collection, the collector cuts approximately 100-120 strands of hair from the crown of the donor’s head. The hair is cut as close to the scalp as possible, so only the strands of hair above the scalp are tested and not the actual hair follicle. This makes hair testing a tamper-resistant screening method.

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