# Beat the hair test

> **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637)
> **Publisher:** CED Clinic (https://cedclinic.com)
> **Canonical URL:** https://cedclinic.com/beat-the-hair-test/
> **Published:** 2026-05-13T17:16:24-04:00 | **Last Modified / Clinically Audited:** 2026-09-28T10:55:13-04:00
> **Clinical Summary:** Your follicles remember longer than your liver does, which is why hair tests measure commitment, not cognition. Via r/trees Further Reading Cannabis Policy WireCED Regulatory Digest, Since Last Digest, 1 items Evidence WatchEndocannabinoid System Research: Cannabis Dosing Guidelines for Family Medicine Practitioners CED Clinic BlogWhen Ketogenic Diet Therapy Is Added After CBD Physician-Led, Whole-Person Care […]

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Your follicles remember longer than your liver does, which is why hair tests measure commitment, not cognition.

Via [r/trees](https://reddit.com/r/trees/comments/1tbzx91/beat_the_hair_test/)

Further Reading
Cannabis Policy WireCED Regulatory Digest, Since Last Digest, 1 items
Evidence Watch[Endocannabinoid System Research: Cannabis Dosing Guidelines for Family Medicine Practitioners](https://cedclinic.com/preventing-alcohol-cannabis-impaired-driving-adolescents/)
CED Clinic Blog[When Ketogenic Diet Therapy Is Added After CBD](https://cedclinic.com/cbd-ketogenic-diet-epilepsy/)

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### Related

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### Verification & Medical Governance

- **Lead Clinical Author:** Benjamin Caplan, MD
- **Credentials:** Board Certified in Family Medicine (ABFM), Former CMO Canna Care Docs (250,000+ patients supervised), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House).
- **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`).
- **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/).
- **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637).
- **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).