How Do I Pass a Marijuana Drug Test?

marijuana drug test

How do you pass a marijuana drug test? And how long does marijuana stay in your system? Here’s some useful information.

Unfortunately a marijuana drug test can detect marijuana use from days or even months ago, depending on the type of test. Knowing the type of marijuana drug test your taking is vital to understanding how to pass one.

Marijuana Drug Test: Urine

A urine test is the most popular form of marijuana drug test. Unfortunately marijuana stays in your urine much longer than it stays in your saliva (though not near as long as it stays in your hair). Research shows that:

    • For someone consuming marijuana for the first time, or at least the first time in several weeks or months, it should be out of their urine within 5 to 7 days.
    • Marijuana will stay in urine for 10 to 20 days for those who consume marijuana regularly (a few times a month to a few times a week).
    • For those who consume marijuana daily, it could last 30 to 77 days.

Here are a few of the factors that go into how long marijuana stays in the urine:

  • The THC percentage of the marijuana used
  • The BMI of the marijuana consumer
  • How often the person consumes marijuana
  • The consumer’s metabolism

So How Do I Pass a Marijuana Drug Test that uses Urine?

The easiest solution is to simply not consume marijuana for 7 to 77 days, depending on how often you typically do so. However, for many this isn’t something they want to do willingly. Here are a few other options:

  • The use of synthetic urine is one of the more popular methods people use to try and pass a marijuana drug test. However, this method varies in its success. It requires the person using it to properly heat up the fake urine (which is typically attached to a belt worn under the clothes) using warmers. If done correctly, this method can and often does work. But not heating it properly, or having a low-quality product (there’s a lot on the market and they vary greatly), can result in the testers detecting that it’s fake.
  • Another option is to do a search for “marijuana detox products”. There’s a large number of products on the market designed to clear your system of marijuana. However, it is highly recommended that you do a lot of research on the product before you buy it; as with synthetic marijuana the quality varies greatly and some are outright scams.


Marijuana Drug Test: Saliva

A saliva-based marijuana drug test is by far the easiest to pass. Research (and tons of anecdotal evidence) shows that even heavy smokers can pass a marijuana drug test that uses saliva by abstaining from marijuana for 72 hours. If you’re a light consumer, or a one-time consumer; it’ll be out of your system in 24 to 42 hours.

So How Do I Pass a Marijuana Drug Test that Uses Saliva?

If you for some reason aren’t able to abstain for 24 to 72 hours; you can try sucking on a large amount of sour hard candy (5 – 10 pieces over the course of the 2-3 hours leading up to the test). This isn’t fool-proof, but can help to dilute the saliva and this make the THC not as easy to detect.


Marijuana Drug Test: Hair

On the opposite end of the spectrum, hair tests are by far the hardest marijuana drug test to pass. Marijuana can be detected in the hair for up to a year for even one-time use, and potentially longer if you’re a regular consumer. Fortunately hair tests are rarely used, mostly due to their cost compared to urine and saliva tests.

So How Do I Pass a Marijuana Drug Test that Uses Hair?

Unfortunately the invasive nature of hair tests make them pretty much impossible to pass without abstaining from marijuana use for at least a year.



A little-known fact is that most standard drug tests don’t actually test for THC. Instead, they test for THC-COOH.

THC-COOH is the main secondary metabolite of THC (it’s also called 11-COOH-THC). It is formed in the body by oxidation after marijuana consumption. 11-COOH-THC is not psychoactive like THC.

What’s the Importance of THC-COOH When it Comes to Marijuana Drug Tests?

THC-COOH has a much longer half-life than THC. This greatly increases its detectability range. According to a study published in the journal Clinical Pharmacology & Therapeutics, THC-COOH can be detected up to 77 days after last use.

Although many tests are search for THC-COOH, some tests do distinguish between 11-OH-THC and 11-COOH-THC. If they do, it’s more likely they’re searching for recent marijuana consumption.


Can You Fail a Marijuana Drug Test Due to CBD Consumption?

Pretty much all drug tests test for THC metabolites, not cannabidiol (CBD). Due to this, consuming CBD that has absolutely no THC (either by having it removed, or by using CBD derived from hemp) will not cause a failed drug test.

About Emily Watkins 158 Articles
Emily Watkins is a PhD student majoring in public policy. Emily has been a freelance editor for multiple websites, and has spent hundreds of hours volunteering to help legalize marijuana. She currently resides in sunny Los Angeles, and can be reached at