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    The Forensic Limits Of Hair Drug Testing: A Critical Assessment Of Drug Intake And Hair Concentration Relationships

    April 2026 in “ Science & Justice ”
    Daniel Preece, Abigail Jones
    Studysummary This review reports that hair analysis can confirm drug exposure but not accurately estimate doses due to variability and confounding factors like melanin and cosmetic treatments, suggesting it should be used as a qualitative forensic tool rather than for precise dose quantification.
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    Research cited in this study 3

    1. Asian Hair: A Review of Structures, Properties, and Distinctive Disorders Clinical, Cosmetic and Investigational Dermatology · 2020
    2. Dose–Hair Concentration Relationship and Pigmentation Effects in Patients on Low-Dose Clozapine Forensic Science Medicine and Pathology · 2007
    3. Incorporation of Isotopically Labeled Cocaine and Metabolites into Human Hair: Dose-Response Relationships Journal of analytical toxicology. · 1996