Hair Drug Testing for Child Custody & Family Law
How court-admissible hair testing provides evidence in custody disputes, and what the Family Court actually looks for.
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When a family law matter turns on the safety of a child, the quality of the evidence matters more than anything else in the file. Hair drug and alcohol testing is one of the most reliable and court-admissible tools available to Australian families in custody disputes, and it is among the most commonly requested services we provide.
This is rarely an easy time. Whether you are concerned about a co-parent’s substance use, have been asked to test yourself, or have been directed to by a court or a lawyer, the process below is what to expect.
Why hair testing is used in family law
Where allegations of drug or alcohol use arise in a parenting dispute, the court may request — or a party may seek — independent forensic evidence to support or refute them. Hair testing suits that job for four reasons.
It covers an extended period. A 3 cm sample of head hair reflects approximately three months of history, so a single test speaks to sustained behaviour rather than the few days before the appointment.
It is very difficult to defeat. Urine and saliva tests can be managed with short-term abstinence or substitution. In hair, substances are incorporated into the shaft as it forms and cannot be washed out or disguised.
It is court-admissible. Testing is performed through HASTA, a NATA-accredited forensic laboratory working to ISO/IEC 17025, using mass spectrometry under a documented chain of custody — the standards Australian courts expect.
It is quick and non-invasive. Collection takes 15 to 20 minutes and involves a small, discreet trim from the crown of the head. No needles, no blood.
What hair testing detects
The standard panel screens for over 95 drugs and their metabolites in a single analysis, including:
- methamphetamine and amphetamines
- cannabis (THC)
- cocaine and its metabolites
- MDMA (ecstasy)
- opioids including heroin, morphine, codeine and oxycodone
- benzodiazepines
- ketamine
See the full list of substances we test for. Alcohol testing is separate, measuring ethyl glucuronide (EtG) to assess drinking over the past three to six months, and steroid testing covers a further 42 substances.
Who can request a test
You can, for yourself. If you want to demonstrate your own sobriety to the court or to your legal team, book an appointment directly — no referral needed.
Your family lawyer can. Solicitors refer clients to us regularly, both to build a case and to answer one. There is more detail on what we provide to legal practitioners.
The court can order it. In some matters the Federal Circuit and Family Court of Australia directs one or both parties to undergo testing as a condition of proceedings. If that has happened, see court-ordered drug testing and who pays for it.
In every case the person tested must provide valid photo ID and consent at the time of collection. We do not accept anonymous samples, or samples collected without the donor’s knowledge.
The process, step by step
- Book. Call (03) 9380 5434 or book online. Same-day appointments are usually available at our Melbourne clinic, and remote collection kits can be arranged for interstate clients through your GP.
- Attend. Bring government-issued photo ID — driver’s licence or passport — and allow 15 to 20 minutes.
- Collection. About 120 strands are trimmed from the crown of the head. Discreet, non-invasive, over in a few minutes.
- Chain of custody. The sample is sealed in tamper-evident packaging, signed by both you and the collector, and given a unique identifier. The custody and control form is completed on the spot.
- Payment. Laboratory testing begins on receipt of full payment, which can be made at the clinic or online.
- Analysis. The sealed sample goes to HASTA for analysis by high-resolution mass spectrometry.
- Results. Emailed within 5 to 7 business days, and released to nobody else without your written consent unless the law requires it.
- Interpretation. For family law matters we recommend a written medico-legal interpretation report from Dr Michael Robertson, which explains the result in terms a court can use. It carries an additional fee.
If you test positive
A positive result does not decide your case. The test measures the presence and concentration of a substance; what that means in a legal context is a matter for forensic interpretation and, ultimately, for the court.
An interpretation report addresses the questions the number alone cannot: the level of use indicated, the likely pattern of consumption, and whether a prescribed medication explains what was found. What the concentrations mean is a useful starting point.
If you have been falsely accused
A hair test is one of the strongest tools available to you. Because it covers three to six months, a negative result is evidence of sustained abstinence — far more persuasive than a urine or saliva test covering a few days.
If a screening result is the problem rather than the absence of one, the relevant reading is how to challenge a false positive hair result, or, where the result came from a urine screen, why those produce false positives for methamphetamine.
To talk it through before booking, call (03) 9380 5434. All enquiries are confidential.
Ready to book?
Same-day appointments are usually available, results come back within 5 to 7 business days, and the testing is court-admissible and NATA-accredited.
Call (03) 9380 5434 or book online.
Frequently asked questions
Is hair drug testing admissible in the Federal Circuit and Family Court of Australia?
Testing is performed by a NATA-accredited laboratory using mass spectrometry under a documented chain of custody — the standards required for a result to be legally defensible in Australian proceedings. Expert forensic interpretation reports and court testimony are available through Dr Michael Robertson.
Can I request that my co-parent be tested?
Not directly. Nobody can be compelled to test without their consent or a court order. Your family lawyer can apply to the court for testing to be ordered as part of the proceedings, and if the other party refuses a court-ordered test, the court may draw its own conclusions from that refusal.
How far back does a hair drug test go?
A standard 3 cm head hair sample reflects approximately three months of history, and a 6 cm sample approximately six months. Those timelines assume an average growth rate of about 1 cm per month; individual rates vary between roughly 0.7 cm and 1.5 cm per month, so a timeline is an estimate rather than a set of dates.
How soon after use can hair testing detect a substance?
Generally 8 to 14 days after ingestion — the time newly formed hair takes to grow above the scalp. This varies between individuals with hair growth rate.
What if the person being tested has very short hair, or none?
Body hair can be used instead: underarm, beard, chest, arm, leg or pubic hair. Body hair timelines are less precise than head hair because a higher proportion of follicles are dormant, so head hair is preferred wherever it is available, particularly for legal matters.
Can hair testing distinguish prescribed medication from illicit use?
Often, yes. The laboratory can differentiate between many substances that share metabolites — methylamphetamine and dexamphetamine produce overlapping results, for instance, and forensic interpretation supplies the context. Declare all prescribed medications on the chain-of-custody form at the time of collection. Where the distinction matters to your case, an interpretation report is strongly recommended.
Can bleaching or dyeing hair affect the result?
Chemical treatment can reduce drug concentrations to some degree, but it does not reliably remove them. The laboratory's detection thresholds go as low as 1 picogram per milligram, and analysts are trained to identify chemically treated samples. Attempting to manipulate a result this way is unlikely to succeed and may itself raise questions in court.
How much does testing cost for a family law matter?
It depends on the panel required — drugs, alcohol, steroids or a combination. Interpretation reports and court testimony carry additional fees. The full breakdown is on the fees page.
Can I get results quickly if my court date is soon?
Standard results are returned within 5 to 7 business days. An expedited service is available for an additional fee, where the sample is prioritised at the laboratory on the day of collection. Expedited testing is not available after 5 pm on weekdays, or on weekends and public holidays. If you have a hearing date, book as early as you can.
Is the process confidential?
Yes. Appointments, results and communications are confidential. Results are not released to any third party — including the other party in your matter — without your explicit written consent, unless required by a court order or by law.
Can I attend without my lawyer knowing?
Yes. You can book and attend independently. Many clients test proactively before consulting their lawyer so the result forms part of their initial case strategy.
What is the difference between a result report and a forensic interpretation report?
A result report lists the substances detected and their concentrations in picograms per milligram against reporting thresholds. It confirms presence or absence and stops there. A forensic interpretation report, prepared by Dr Michael Robertson, addresses what those numbers indicate about likely pattern, frequency and significance in a legal setting. For family court matters the interpretation report is strongly recommended.
