What Is A Hair Drug Test?

In hair drug testing, also called hair drug screening, a person’s hair strand is used to find out which drugs were used by a person during the past few months.

A small sample of hair is used, so the drug test identifies and measures all the molecules that are present in your bloodstream during the past 90-180 days. This type of drug test can tell the metabolic use of the drug that was produced after the drug was consumed by the human body.

How Long Does Marijuana /Weed Stay In Your Hair?

So let’s cut to the chase: how long does weed stay in your hair?

Well, it takes roughly 5 days for weed to appear in your hair, although it can keep on being perceivable through a hair medication test for a while. The amount of Marijuana and other drugs in your hair are all absorbed into your hair at the same rate.

Weed is ingested in your body and courses through the circulation system into your blood, pee, spit, and into the hair follicles utilizing the circulatory system. The medication metabolites that are stored into your hair follicle are captured in the hair shaft as it becomes out from your hair follicle. The normal growth rate for hair is roughly 0.5 inches per month.

It is said that it is the most accurate test, the companies, and labs who offer this drug test they claim the accurate results like for example 99 percent correct results. The fact is that metabolites cannot be simply removed from your hair.

What Is The Time Span For The Drug Test?

The hair drug test normally tests for drug us back 90 days, but it also depends on upon the growth of hair. The sample that is required for this drug testing is cut almost at 3.7 inches.


What Types Of Drugs That Can Be Detected?

  • Marijuana
  • Phencyclidine
  • Cocaine
  • Codeine, morphine
  • Methamphetamine
  • Nicotine
  • alcohol

Can Body Hair Be Used In The Drug Test?

Yes, this is true that the hair that exists on the body can be used for drug testing like the hair from the head. But actually, the rate of growth of the body hair is less as compared to the hair of the head. The other fact is that it takes one year to replace the body hair that is why it is challenging to represent it accurately.

What If A Person Is Bald?

In the case that a person is bald then the collection of hair can be done by taking the samples from other areas of the body, but the pubic area is restricted from the collection.  If there is a rare case that no hair can be collected, then the other option is urine testing.

For a brief history of drug testing, Check here.

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