Companies That Use Hair Follicle Drug Testing: Which Industries Do It and How to Find Out Before You Apply

Updated 18 Oct 2026 · By the DrugTestAnswers editorial team

If you've heard that a company you're applying to "does hair," you're probably trying to figure out two things: which employers actually use hair follicle drug testing, and how to know before you're sitting in a collection site. There isn't an official public list, because most companies don't announce their testing method and policies change. What we can show you is which industries lean on hair testing, the signs that a specific job uses it, the state laws that limit what hair tests can be used for, and how to check your own status first. We may earn a commission if you buy through our links.

Why there's no reliable master list

You'll find forum threads and old blog posts naming specific employers, but treat them with caution. A company can use hair for some roles and urine for others, switch labs, change policy after a merger, or test differently in different states. A list that was true three years ago may be wrong today. The better approach is to understand which employers are most likely to hair test and then confirm for the actual job you want.

Why some employers choose hair over urine

Hair tests cost more than a basic urine cup, so employers who use them usually want something specific:

• A longer look-back. A standard head hair sample covers about the last 90 days, compared with a few days for most drugs in urine.
• Harder to cheat. The collector cuts the hair in front of you, so there's no private bathroom step to swap or dilute a sample.
• Pattern of use, not one weekend. Hair is better at showing repeated use than a single occasion, which some employers see as more relevant to hiring.

Industries where hair testing is common

Based on what testing labs and screening companies say about their customers, hair testing shows up most often in these areas:

• Transportation and logistics. Many larger carriers add a hair test for new hires on top of any required federal urine test. (Federal testing itself isn't something this site covers or helps with.)
• Casinos and gaming. Gaming jobs handle cash and face regulator scrutiny, and some operators use hair for pre-employment screening.
• Law enforcement and public safety. Police departments, corrections and some fire departments use hair tests during hiring.
• Financial services and security. Banks, armored transport and private security firms sometimes use hair for roles with access to money or sensitive data.
• Healthcare. Hospitals and pharmacies, especially for roles with access to controlled medications.
• Oil, gas, mining and heavy industry. Safety-sensitive work sites often favor longer detection windows.
• Executive and high-trust roles. Some companies use hair only for senior hires or positions with significant responsibility.

Retail, food service and many office jobs more commonly use urine or mouth swab tests, if they test at all. That's a general pattern, not a rule.

How to find out if a specific job hair tests

You can usually learn the testing method before the appointment without raising eyebrows:

• Read the offer letter and consent form. Many forms name the specimen type ("hair," "urine" or "oral fluid") and the lab.
• Look at the collection site instructions. If you're told not to wear hair products or that the visit takes longer than a bathroom visit, that's a clue.
• Ask HR or the recruiter. "What kind of drug screen is it, and where do I go?" is a normal question. It's practical, since hair, urine and swab visits work differently.
• Check employee review sites. Recent posts about the hiring process sometimes mention the type of test. Weight recent, role-specific posts over old general ones.

State marijuana laws that limit hair tests

A growing number of states restrict how employers can use cannabis results, and hair tests are often affected because they detect a non-impairing THC metabolite rather than current intoxication. For example, California's law that took effect in 2024 bars most employers from penalizing off-the-job cannabis use or making decisions based on tests that only find non-psychoactive cannabis metabolites, with exceptions for certain construction jobs and federally regulated roles. New York, Nevada and Washington also have rules limiting pre-employment cannabis testing for many jobs. Laws change, so check your state's current rules or ask an employment lawyer if you think they apply to you.

These laws generally cover marijuana only. Hair tests for cocaine, opioids, amphetamines and other drugs aren't affected.

What a workplace hair test usually checks

Most employer hair panels look for marijuana, cocaine, amphetamines including methamphetamine and MDMA, opioids, and PCP. Expanded panels can add benzodiazepines, barbiturates, oxycodone and others. Our page on hair drug tests for work goes into the appointment, results timing and prescriptions.

If you're worried about an upcoming hair test

Start by finding out where you stand. A private home hair test sends your sample to a lab, and the result tells you whether you even have a problem. Our home hair test kit guide explains the options.

If you're researching detox shampoos, know what's claimed and what isn't. TestClear's Old Style Aloe Toxin Rid is a deep-cleansing shampoo sold to people facing hair tests, with maker directions that involve repeated washes over several days. There's no independent proof that it gets drug levels inside hair below lab cutoffs. Our Aloe Toxin Rid review lays out the facts. The only sure way to pass is not using.

Tests this page doesn't cover

Don't try to change a DOT, FAA, federal, military, court, probation or parole test. Those programs carry legal consequences far beyond losing a job offer.

Disclaimer and support

This page is general information, not legal or medical advice, and employer policies change. If you'd like help with substance use, the SAMHSA National Helpline is free and confidential 24/7 at 1-800-662-4357. In a crisis, call or text 988.