Court-ordered hair follicle drug testing.
A hair test is what a court usually orders when the question is whether there's a pattern of drug use over months, not whether someone used last weekend. Here's what the test actually shows, what a result does and doesn't establish, and how to get a collection that holds up — anywhere in the country.
What a court is asking for when it orders a hair test
Hair is what toxicologists call a reservoir matrix: as it grows, drugs and their metabolites are incorporated into the shaft, leaving a record that stays there. Cutting a small sample close to the scalp gives a laboratory a months-long history rather than a snapshot of the last few days.
That's why courts reach for it. When the question is whether a parent has a sustained pattern of use — not whether they used on one particular night — a hair test is built for that question in a way a urine screen is not. It is also difficult to defeat: the sample is collected in person by a trained collector, in view, so the substitution and dilution problems that shadow urine collection don't apply.
The 90-day window, honestly.
Head hair grows at an average of about half an inch a month. The laboratory tests the 1.5 inches closest to the scalp — three months of growth, which is where the familiar "90 days" comes from. It isn't a marketing round number; it's arithmetic on hair growth.
Two honest qualifications come with it. The most recent few days aren't in the sample yet. Hair that has formed in roughly the last five to seven days hasn't emerged above the scalp, so very recent use falls outside what a hair test can see — which is one reason a court concerned with a specific recent date orders something else. And a single episode may not register at all. Hair testing is built to reveal a pattern; isolated use can fall below what the test detects. A negative hair test is not proof that someone has never used.
Body hair works differently. It grows to a set length, stops, and eventually sheds and regrows — a cycle that can span up to a year. That's why body hair can reflect use over a much longer period, up to roughly 12 months, and why it's sometimes collected when head hair is unavailable or too short. The trade-off is that the timeline is less precise.
Which one gets collected usually takes care of itself. Standard procedure is head hair where it's available and body hair where it isn't, so an order doesn't need to say. Where an order does name body hair specifically, that's normally a deliberate choice for the longer window — and it's worth a call first, because the question that decides whether it works is whether the donor has collectable body hair at all.
Call before the order is written.
We're happy to talk through the details of the case and what you're trying to establish.
The question we're asked most often is "what's the best test?" Each test is a tool on a belt. A hammer is the best thing there is for driving a nail, and that doesn't make it better than a screwdriver. Choosing the right one for the circumstance is the work.
What we need at this stage: what's alleged, what period the case turns on, what drugs are of concern, and what you expect the other side to say. From that we can tell you which test fits, what you can and can't expect it to establish, and how the order should be worded. We keep court order language for exactly this, and we'll help you customize it for your case — specific wording that avoids the pitfalls we see most often.
Often we only get one chance to collect a sample, so it has to be right the first time. An order that says "hair test" without naming a panel, or names a panel that doesn't include the substance actually at issue, or sets a timing window the test can't cover, still gets collected exactly as written. The report comes back and doesn't establish what anyone needed it to establish. A loosely written order also hands the donor control: if the order doesn't specify, they decide when to test, where to test, and which panel gets run.
That's harder to fix than it sounds. Hair keeps growing and the window keeps moving, so a second attempt months later isn't testing the same period — and depending on where the case has gone by then, the opportunity may simply be gone.
TrueTest has been in business since 2010, and the preferred service provider on thousands of cases in family courts since 2020. That's the whole reason we can tell you what a workable order looks like: we've seen which ones produce a usable result and which ones produce an expensive report nobody can rely on.
There's no charge for that conversation and it takes a few minutes. It's the cheapest part of the entire process.
Already holding an order? Read it to us and we'll tell you what it actually asks for — and whether it asks for the right thing, while there's still time to have it amended.
What does a court-ordered hair test cost?
The panel decides the cost, and the order usually decides the panel. A hair test runs anywhere from a basic five-substance panel up to an eighteen, and the order may add alcohol (EtG) or specify a look-back that changes what's collected. Are hallucinogens a concern in this case? Is kratom? Each of those is a different test at a different price, so a number quoted without knowing which one your case requires would be a guess.
If the order hasn't been written yet, this is the call to make. We'll tell you what the panel you're contemplating costs before it gets locked into an order you can't easily change.
If you're already holding one, read it to us or send it over and we'll tell you what it actually asks for and what that costs. That also catches the expensive mistake we see most often — someone pays for a panel that doesn't match what the order names, and the result doesn't answer the question the court asked.
Hair, urine, or PEth — which one a court orders, and why.
There's no single best test. Each is best at the job it was built for, and the right one depends on the question being asked — and on what the order says.
| Test | Looks back roughly | The question it answers |
|---|---|---|
| Hair (head) | ~90 days | "Is there a pattern of drug use over recent months?" |
| Hair (body) | Up to ~12 months | "Is there a pattern over a longer period?" — with a less precise timeline. |
| Nail (finger or toe) | Fingernail ~3–6 months; toenail up to ~12 | "Is there a pattern over months, when hair can't be collected?" |
| Urine | Days | "Was there use around a specific recent day or event?" |
| PEth (blood) | ~2–4 weeks | "Has there been drinking over the past few weeks?" — alcohol only. |
Alcohol is the case where the distinction matters most. Hair can carry EtG, the alcohol marker, but chemical treatments — bleaching, coloring, perming — can reduce measurable EtG in hair, which is one reason a direct blood biomarker is well suited to the alcohol question. If your matter turns on drinking rather than drugs, start with how PEth results are reported and read. Not sure which your order names? That's the call to make before anyone is collected — see our guide to choosing the right family-court test, or read the order to us.
When hair isn't available: nail testing.
Fingernails and toenails are keratin, the same material as hair, and the same panels run on them. A fingernail covers roughly three to six months; a toenail can reach up to twelve.
The usual reason to reach for nails is that hair isn't there — too short to cut, or shaved. But nails aren't only a fallback: a toenail covers roughly the same ground body hair does.
Substituting nails for a court-ordered hair test isn't a call made at the collection site. If the order names hair and hair can't be collected, we notify all counsel and the guardian ad litem, confirm agreement in writing, and then collect. An order that anticipates the possibility avoids that round of correspondence entirely.
What a hair result can't establish.
This is the part that decides whether a result is used well or oversold. A hair test is strong evidence of a pattern. It is not a timeline, not a dose, and not a diagnosis — and a result standing alone, with no one to explain its limits, invites the worst available reading of it.
Not how much
A positive doesn't quantify use. People incorporate drugs into hair at different rates, so a level can't be read backward into an amount consumed.
Not how often, and not when
A hair result covers a span of months as a whole. It can't point to a date, an evening, or an event within that window.
Not the last few days
Hair formed in roughly the past five to seven days hasn't grown out above the scalp yet, so the most recent use isn't in the sample.
Not automatically ingestion
A drug can reach hair from a contaminated environment as well as from use. That's a real analytical question, addressed below — and, for a child's hair, it's the whole point of a different test.
Not a diagnosis
A laboratory value is not a finding that someone has a substance use disorder, and it doesn't describe anyone as a parent.
Not impairment
A hair result says nothing about whether someone was under the influence at any given moment. It's a look-back across months, not a measure of anyone's state on a particular day.
Environmental exposure — in family court, an asset rather than a liability.
In most forensic settings, an exposure explanation weakens a positive hair result. The argument is that the donor didn't consume the drug — they were simply around it — and in many contexts that carries real weight. In family court it tends to do the opposite. Where the question in front of the court is the environment a child is living in, "the drugs were around me, I just didn't take them" is not the defense it appears to be.
To define the term: environmental exposure refers to the physical transfer of a drug into hair from a contaminated environment — when someone is consistently present where a drug is smoked, handled, manufactured, or distributed, the drug transfers from that environment and becomes incorporated into the hair. It's a recognized phenomenon and a legitimate line of inquiry when a result is contested. In the cases we collect for, it's the challenge raised most often against a positive.
Which is exactly why it deserves a harder look here. If a parent or caregiver is consistently in an environment where a drug is present in concentrations high enough to transfer into their own hair, that same environment is one the child may share. A positive explained by environmental exposure is not a clean bill of health. It is, at minimum, evidence of proximity to drugs significant enough to warrant further investigation, not less. The explanation raises a question about the child's environment rather than settling it.
That cuts both ways, and the direction matters. We can't tell you a positive definitely came from the environment — the data doesn't work that way. But in some cases the results can rule environmental exposure out. So where a positive is being explained away as exposure, whether the data actually supports that explanation is sometimes a question that can be answered rather than argued.
When the question is what's reaching the child.
Sometimes the question isn't what a parent used — it's whether drugs in the home are reaching the child. That's a different test, run on the child's own hair, and it's designed around exactly the ingestion-versus-exposure distinction described above: it looks for both the parent drug and the metabolite the body produces, so a laboratory can speak to whether something was merely in the child's environment or actually processed by the child's body. A standard hair panel isn't built for that question.
There's also a practical situation worth knowing about: if the other party refuses to submit to hair testing but regularly has custody of the child, testing the child may be the next best route to finding out whether there's a drug issue in that household.
Getting the collection done — here or anywhere in the country.
Hair is always collected in person by a trained collector — there's no at-home version of a court-ready hair test. We collect at our Elk Grove Village office, and we arrange court-ready hair collections anywhere in the country through a nationwide collection network. Either way, the sample is cut close to the scalp, sealed in tamper-evident packaging, and documented under an unbroken chain of custody from the moment it's taken.
It's worth knowing who does what, because most people assume the place that cuts the sample is the place that tests it. It isn't. Four separate jobs are involved, and the first one happens before anyone is collected:
- Selecting the correct test. An order that says "hair test" can mean a five-substance panel or an eighteen, with or without alcohol added — and if the question is about a child rather than a parent, it's a different test altogether. Get this one wrong and nothing downstream repairs it.
- The collection provider takes the specimen and documents how it was handled from the moment of collection.
- An accredited laboratory analyzes it and reports the findings against its own cutoffs.
- A qualified expert can, if it's ever needed, put an explanation of what the result means on the record.
Most providers can do one or two of these. Some places will sell you the test you asked for and get you a result, and the service ends there. TrueTest does all four: making sure the test matches what your order actually requires, that the collection happens somewhere it can be documented properly — sometimes at that same site near you, if that's the right place for it — and that it runs through the laboratory suited to that testing. And the value doesn't end when the report goes out. We're often needed afterward to explain what a result says, so it doesn't get stretched further than the data allows.
If a result has already landed on your desk, call. We'll explain what it says, confirm you're looking at an actual laboratory report rather than something produced by another party, and advise whether a review by a Medical Review Officer (MRO) is warranted. Not everything that looks like a laboratory report was produced for a court. If you're holding a PEth result, our piece on whether a PEth result was built for court walks through what to check. And if you're still deciding what a case calls for, our family-court testing guide works through the choice.
Hair testing questions, answered.
Can a family court judge order a hair follicle test?
Yes. Courts routinely order drug testing in custody and parenting matters, and hair is one of the methods commonly named — particularly when the question is whether a pattern of use exists over months. The order itself controls what gets tested, which panel, and sometimes the timing. What we can tell you is what your order actually asks for; whether and how to respond to an order is a question for your attorney.
How much does a hair follicle drug test cost for court?
It depends on the panel your order requires — a basic five-substance panel and an eighteen-panel with alcohol added are different tests at different prices. Rather than quote a number that may not match your case, we'll read the order with you and tell you exactly what it calls for and what that costs. Call 847-258-3966 or send us the order.
How far back does a hair test go?
Head hair is tested 1.5 inches from the scalp, which at an average growth rate of about half an inch per month covers roughly 90 days. Body hair can reflect a longer period — up to about 12 months — because it grows to a set length and sheds on a longer cycle, though with a less precise timeline.
Can a hair test detect a single use?
Often not. Hair testing is designed to reveal a pattern of use over months, and an isolated episode may not register at all. That's a real limitation, not a loophole — and it's why a court asking about one specific recent occasion is usually pointed toward a different test.
Can secondhand smoke or being around drugs cause a positive?
A drug can transfer into hair from a contaminated environment, so a positive is not automatically proof of ingestion — that's a recognized phenomenon and a legitimate question when a result is contested. But in a family-court setting it cuts both ways: if someone is around a drug often enough and in high enough concentration for it to appear in their hair, that environment is one a child may also be in. It raises a question about the child's surroundings rather than closing one.
Can hair testing be affected by detox shampoos or hair treatments?
We're asked this often, and the simple answer on detox and cleansing shampoos is no. Those products promise what they can't deliver.
Chemical treatment is a different matter. Bleaching or perming can reduce measurable EtG and drug metabolites, and that effect is documented — it's something the laboratory and a retained expert can speak to. That's why we advise against bleaching or dyeing before a test, and why our court order language specifies it directly: the donor is ordered not to cut, dye, or chemically treat hair for four weeks prior to collection.
If head hair is unavailable or too short, body hair or nails can generally be collected instead.
Does TrueTest interpret my hair test result?
We'll tell you what the result says and what it doesn't — what the laboratory reported, against which cutoffs, and what that does and doesn't establish. In most cases that's enough, and the question ends there.
Where a result is being contested, it can be escalated. The laboratories make experts available who can speak to interpretation for a specific case, and we'll connect you. If you're holding a result you can't fully parse, get in touch.
Before the order is signed, let's talk.
Tell us what the case involves and we'll tell you how the order should read, which test fits, and what it costs — before anyone is collected, wherever your client is. Already holding an order? Read it to us and we'll tell you what it actually asks for.