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Pass a Hair Drug Test Fast: Everything You Need to Know

PUBLISHED: Tuesday, January 18, 2022

Looking for a way to get marijuana out of your system fast? Do you want to know how to pass a hair drug test? Then you’ve come to the right place.

We’re here to help you pass a hair follicle drug test - the fastest-growing method used by employers to detect marijuana.

To best prepare for these tests, it is important to understand how marijuana becomes detectable in the hair and the methods to prevent it from showing a “positive” test result.

How to Pass a Hair Drug Test

Table of Contents

How long does THC stay in the hair?


New drug deposits can’t penetrate dormant (nongrowing) hair. A 1.5-inch hair sample from the head or the body can usually trace drug use as far back as 90 days or even longer, though the detection window also depends on the person tested.

There are also several factors that can affect how long THC stays in your system, such as:

  • How much you smoked
  • How strong/potent your weed and strain is
  • Your metabolism and diet
  • Your body fat percentage
  • How much you exercise and sweat

How Long THC Leaves The Body
Click to Enlarge

So remember: There is no definitive time frame for how long THC remains in your body.

With that in mind, it’s important to start preparing for your hair follicle test by knowing how to beat a drug test as soon as possible. But what exactly is a hair follicle test and what happens during one?

What is a hair follicle drug test?

A hair follicle test is a type of screening that uses a small sample of hair to identify the presence of THC metabolites and other drugs. It is one of the most popular methods of testing for companies because of its high level of accuracy. This means it's pretty hard for you to pass a marijuana drug test.  

While most companies test with blood and urine samples to check for recent drug use, the hair follicle test is able to detect long-term drug use. A human hair can store a longer history compared to urine and blood, where the drug is flushed from the system in a matter of weeks. Through a hair follicle test, THC metabolites can be detected for as long as 90 days. This means that you need to at least the ways on how to pass a hair drug test.

How does it work?

A clinician cuts a small sample of your hair, about 3 clumps with approximately 50 strands each. The hair grows about .5 inches per month so about 1.5 inches of hair is taken as a sample. This sample is usually taken from the back of your head to protect your hairstyle. If you are bald, samples may be taken from other parts of your body.


Here are some steps you can take to pass a hair drug test 


Now that you are familiar with how marijuana is detected in the system and how it is detected through a hair follicle test, you’re probably even more worried about passing a drug test.

Don’t worry! Here are some steps you can take to pass a hair drug test.

  • Cleanse your blood and hair naturally

Since marijuana is carried to the hair follicle through the bloodstream, it is important to cleanse your blood of toxins. It takes 30 days for the toxins to leave your bloodstream. Once your blood is clean, your hair shaft will be as well. After 3 months, your hair would have grown 1.5 inches longer and you will have clean collectible samples. 

  • Hasten the cleansing process through diets and supplements


There are plenty of things you need to know to pass a hair drug test. But believe it or not, you can shorten the cleansing processes to a few weeks by going on a detox diet and drinking a daily regimen of herbal supplements. Niacin or Vitamin B3, for instance, triggers the production of histamines and causes blood capillaries to dilate which then allows more toxins to be eliminated. Drink as much water as you can every day and sweat all the toxins out in a sauna or the gym.


  • Cleanse your hair temporarily

    If you're pressed for time or if you failed to do a cleansing diet before your drug test, try using a hair detoxification shampoo.

    Detox Shampoos are designed to remove metabolites and all those older layers of oil from your scalp without damaging your hair. They penetrate the hair shaft's inner structure to release, dissolve, and remove the toxins that have been encapsulated.

    Also, be aware that some shampoos strip the hair of any and all contaminants which damages your hair and render it unfit for testing. This type of shampoo may buy you more time to fully cleanse your system but can also cause suspicion from the clinician or the company you’re applying for.

  • You can use these detox shampoos 3-10 days in advance but if you don’t have that much time, you can take 3-4 showers a day as needed. Just make sure to let it sit in your hair for at least 3 minutes then thoroughly massage your scalp to remove all the residual buildup.

  • Mix up a home remedy

    There are also home remedies you can use that costs a lot less but take more prep time. Most of them involve inexpensive ingredients that are commonly found in the cupboard, such as lemon juice, baking soda, rosemary oil, vinegar, sea salt, and detergent.


    1. Begin by saturating your hair with white vinegar and let it sit for 15 to 20 minutes.
    2. Next, soak your hair with a salicylic acid acne treatment
    3. Lather your hair thoroughly with one cup of liquid detergent. If you don't have liquid detergent, you can add a dash of water to 1 scoop of powder detergent to make a paste and use that instead.
    4. Rinse all the products out of your hair but do not wash or condition. For added measure, you can dye your hair using a store-bought dying kit or repeat these steps as needed.
  • Generally, these home remedies mimic the effect of detoxifying shampoos and work basically the same. Here’s one you can try:

  • Shave all your hair

    This is quite a straightforward solution: It involves removing all the hair in your body with a razor and some shaving cream. If you’re bald from head to toe, then you are unable to submit a sample.

    But be warned: Most clinicians are aware of this trick and may fail you if you can’t submit any type of hair sample.


ONE MORE THING... Before the drug test, check yourself!


The best way to know that you are fully prepared for a hair follicle drug test is to know that you will test negative.  By knowing how to beat a hair drug test, then you'll be set to go through it. Use an at-home test kit to gauge the efficacy of the treatments that you have undergone. At-home hair drug testing kits are easy to use and can detect THC levels even for light marijuana users.

It’s a bit sad that using marijuana is still frowned upon and even illegal in many places today. People should not have to detox after enjoying a weekend or worry about random drug tests but that’s the reality of our world today.

Hopefully, we’ve helped you learn a few tricks to pass a hair follicle drug test. With these tips, you can avoid getting robbed of employment opportunities and remain the effective individual that you are.