Hair Drug Testing — Introduction
Hair drug testing detects drug use over the past ~90 days by analyzing drugs deposited from the bloodstream into the hair shaft as it grows. It's used widely in non-DOT pre-employment, post-accident, and reasonable-suspicion contexts where a longer detection window matters. This module covers everything you need to collect, package, and document a defensible hair specimen.
What This Module Covers
- What hair testing is and when to use it
- The 90-day detection window — how it works
- Cutting technique (vertex posterior, close to scalp)
- The 1.5-inch standard and root-end orientation
- Body hair alternatives
- Packaging, sealing, and chain of custody
- Documentation for legal defensibility
Who This Is For
Non-DOT collectors expanding into hair testing, HR / safety teams running pre-employment hair programs, and clinic staff that work with hair-test labs (LabCorp, Quest, Psychemedics, OmegaLab).
Regulatory Context
Hair testing is not a DOT-authorized methodology. It operates under non-DOT employer policy + laboratory standards (most labs follow LabCorp / Quest / Psychemedics method specs). State law (CA, MD, PA, RI) shapes employer-program licensing.
⏰ The 90-Day Window
Head hair grows ~0.5 inches per month on average. The first 1.5 inches closest to the scalp represent roughly the most recent 90 days of drug exposure.
- 1.5 inches from scalp — ~90 days of detection
- Drugs cross from blood vessels into hair follicles, where they're permanently incorporated as hair grows
- Newly used drugs aren't detectable for ~5–7 days — the hair has to grow above the scalp to be cut
Detection Comparison
| Method | Window | Best Use |
|---|---|---|
| Urine | 1–3 days | Reasonable suspicion, post-accident |
| Oral fluid | 24–72 hours | Recent use |
| Hair | ~90 days | Pre-employment, pattern-of-use |
| Blood | 2–24 hours | Forensic, just-used |
Regulatory Notes
- ! Not authorized by DOT
- Used widely in non-DOT pre-employment and safety-sensitive non-DOT contexts
- State workplace drug testing laws apply (CA, MD, PA, RI have state CLIA + employment provisions)
- Lab follows its own validated method (typically immunoassay + GC/MS or LC/MS confirmation)
The Collector
A hair collector is a trained individual who verifies the donor, prepares the collection site, cuts the hair specimen close to the scalp, orients root-end, packages, seals, and documents.
Definition
A hair collector verifies donor identity, prepares the collection site, performs the cut technique, packages and seals the specimen, completes chain of custody, and ships per lab IFU.
Conflicts of Interest
Don't serve as the collector for the donor's direct supervisor, close relative, or close friend.
Recommended Training
- Knowledge of hair growth biology and detection window
- Lab-specific IFU for the device / kit you use
- 5+ supervised mock cuts — including a body-hair alternative
- Annual refresher
- Documented per-collector / per-lab training records
The Collection Site
A hair collection needs less than urine — no toilet, no bluing — but lighting and a clean, private work area matter more.
Site Requirements
- 1Private, well-lit work area
- 2Clean, flat work surface
- 3Chair for the donor
- 4Storage for sealed kits before/after collection
- 5No food, drink, or contamination sources at the workstation
NOT Required (vs. Urine)
- — No toilet
- — No bluing
- — No restroom security
Security During Collection
- Donor continuously present and observed
- Kit components handled with gloved hands only
- Foil and envelopes kept sealed until use
- No external hair contamination (sweep work area before each donor)
Supplies
Hair collection uses a small kit: scissors, foil, envelope, chain of custody form, and tamper seals. Quality matters more than quantity.
Hair Collection Kit Contents
- Scissors — clean, sharp, dedicated to hair testing
- Comb — for parting
- Foil square — for orienting and packaging hair
- Specimen envelope / cassette — lab-supplied
- Tamper-evident seals — for the envelope and shipping
- Chain of Custody form — lab-supplied
- Gloves — fresh pair per donor
- Lab IFU — printed at site
Pre-Collection Kit Check
- Kit expiration date — current
- Seal intact (no pre-opened kits)
- Lab ID label matches the CCF
- Lot number recorded
The Chain of Custody
The hair chain-of-custody form (usually lab-supplied) documents donor, collector, location of cut (vertex posterior is standard), specimen type (head vs body), seals, and shipment.
Hair Chain of Custody
The lab supplies a chain-of-custody form for every specimen. Common sections:
- Donor information + ID number
- Employer information
- Reason for test
- Date / time of collection
- Specimen type — head or body hair, with location of cut
- Drug panel
- Collector ID + signature
- Donor signature (verifies their hair was cut and sealed in their presence)
- Tamper-evident seal numbers
- Courier name + shipping date
Copy Distribution
- 1Copy 1 — with the specimen to lab
- 2Copy 2 — collector retains
- 3Copy 3 — employer / DER
- 4Copy 4 — donor
Employer Information
Required information is supplied by the employer or testing program. Mirror what you'd collect for instant testing — donor, employer, reason, lab, MRO.
Required from Employer
- Donor name + ID
- Employer name + contact
- Reason for test
- Drug panel
- Lab name + shipping address
- MRO contact
Donor ID & Hair Eligibility
Donor identity verification is standard photo ID. Hair eligibility adds a few wrinkles: bleached / heavily treated hair may complicate testing; insufficient head hair triggers a body hair workflow.
Acceptable ID
- Government photo ID
- Employer photo badge
- In-person ID by employer representative
Hair Eligibility — Head Hair
For a standard head-hair collection, you need:
- ≥ 1.5 inches of hair on the vertex posterior
- Sufficient volume (90–120 mg) — about a pencil-lead diameter, depending on lab
- No active scalp lesions in the cut area
Bleached / Treated Hair
Heavy chemical treatments (bleach, perm, relaxer) can reduce detection. Document the donor's disclosure of recent treatments on the CCF — the lab will note it on the report.
Body Hair Alternative
If head hair is insufficient — use body hair from one of:
- Chest
- Underarm
- Leg
- Beard
The Cutting & Packaging
The collection itself is the part collectors most often get wrong. The hair is cut close to the scalp from the vertex posterior, kept root-end aligned, foil-wrapped, and sealed.
The Cutting Procedure (Head Hair)
Part the Hair on the Vertex Posterior
The vertex posterior is the back of the crown — top-back of the head. Most consistent growth, least sun damage.
Section a Pencil-Lead Bundle
About 90–120 mg of hair (compare to a pencil-lead diameter strand).
Cut Close to the Scalp
Scissors as close to the skin as practical — without nicking. Cut once, decisively.
Maintain Root-End Orientation
The root end (cut end, closest to scalp) is the most recent growth. Lay it flat onto the foil with the root end aligned to one edge.
Mark the Root End
Many kits include an arrow or marker — point it toward the cut/root end. The lab reads from this end.
Fold Foil Around Hair
Sandwich the hair in foil. Don't crease the foil into the hair shaft.
Place into Specimen Envelope
Sealed envelope per lab IFU. Note seal number on CCF.
Donor Initials Seals
In your view. Verifies the specimen is theirs.
Body Hair Procedure
Select Body Area
Chest, underarm, leg, beard. Choose the most abundant.
Cut Close to Skin
Same technique — close cut, root-end orientation matters less since body hair isn't segmented.
Collect Required Volume
Body hair density is lower — you may need multiple passes to reach the lab's minimum.
Document the Site
Mark body hair on the CCF + specify location.
Package, Seal, Ship
Same packaging as head hair.
Shipping
- Specimen + Copy 1 of CCF → lab via the program's designated courier
- No temperature control needed (hair is stable at room temp)
- Ship same business day if possible
When Things Go Sideways
When the donor doesn't have enough head hair, has bleached or heavily processed hair, or refuses — there's a defined response. Knowing them is half the job.
Insufficient Hair
- < 1.5" head hair → body hair
- Insufficient body hair too → notify DER, employer arranges alternative test method
- Recent shave / hair loss → document on CCF
Refusal Triggers
- ! Refuses to allow cutting
- ! Refuses to sign the CCF
- ! Leaves the site before complete
- ! Caught tampering (planting hair, substituting)
Fatal Flaws
- ! Collector signature missing
- ! Specimen ID doesn't match CCF
- ! Seals broken or missing
- ! No specimen received with CCF
- ! Donor signature missing on the chain of custody
Post-Collection Non-Negative
Hair non-negatives go through the same MRO workflow as urine: lab → MRO → donor (medical review) → employer. Don't announce results to the donor at the collection site.
Training & Documentation
Non-DOT hair collectors don't have a federal qualification standard — but most labs require their own training. Document your training and your QC.
Recommended Training Structure
- aHair biology and detection window
- bLab-specific IFU walkthrough
- c5+ supervised mock cuts — head + body hair
- dRoot-end orientation proficiency demonstration
- eAnnual refresher
- fDocumented per-lab certification (lab may require their own training pass)
Recommended Retention
| Record | Period |
|---|---|
| Negative CCFs | 1 year |
| Non-negative CCFs & lab reports | 5 years |
| Kit lot numbers / QC logs | 2 years |
| Collector training records | While active + 2 years |
CLIA Notes
Hair testing labs operate under CLIA — but the collection site (your role) does not generally require CLIA. Verify state law (CA, MD, PA, RI add state CLIA layers).
Best Practices
Hair collection looks easy until you do it. Wrong orientation, too far from the scalp, exposed to contamination — these are the everyday mistakes that kill tests. A checklist makes this a 5-minute procedure done right.
Top 10 Hair Collection Mistakes
- 1Cutting too far from the scalp (loses recent-use detection)
- 2Losing root-end orientation in the foil
- 3Cutting from a non-vertex area (less consistent growth)
- 4Insufficient volume — short specimens get cancelled
- 5Not documenting recent bleach / perm treatments
- 6Mixing head hair and body hair in the same specimen
- 7Forgetting donor signature on the chain of custody
- 8Not recording kit lot / expiration
- 9Telling the donor a result at the site (no result is read at site)
- 10Shipping without sealing tamper-evident envelope
Best Practices Checklist
- Always cut from the vertex posterior
- Close to scalp — without nicking
- Root-end aligned to the foil edge / arrow
- 90–120 mg volume — pencil lead diameter
- Fresh gloves and clean scissors per donor
- Donor initials seals; signs CCF
- Ship same-day, no temperature requirement
Ready to add hair to your testing program? Contact us about training and lab partnerships.