How To Pass A Marijuana Drug Test

May 25, 2021

Because marijuana is not yet treated like other legal drugs, workers need to be constantly worried about whether or not they will be denied employment because they didn’t ‘pass’ a marijuana drug test. This is especially true if you use marijuana for its medicinal purposes. Medical marijuana patients will need to have a prescription that is recognized in the eyes of the law.

Several companies claim they have products that make you pass a drug test.

Since marijuana is not recognized according to US federal law, even states that allow the use of medical marijuana will generally have companies that don’t allow the use of marijuana. Occasionally states give employers the opportunity to grant exceptions for the allowance of medical marijuana users with legal prescriptions, but there are only a few employers who accept that offer.

It’s important to know whether or not your company has medical marijuana policy exceptions. Do it discreetly, of course. If they do not, there are still a few steps you can take to pass the test. Then again, there are also plenty of techniques people use to try and get around the positive results of their test, all of which are highly ineffective and a waste of time.

Useless attempts

Making excuses for your positive drug test is not going to get you anywhere. Although false positives do very occasionally happen, the chances of your employer believing you over the lab are extremely slim. Don’t bother arguing about it.

Some people try using the legally prescribed drug for acid reflux, called Protonix. Its FDA label clearly states that false urine tests are a possibility while taking this drug. Unfortunately, nowadays there are backup GCMS (gas chromatograph-mass spectrometer) tests that will eliminate the possibility of this leaving you in the clear. If your employer is private, however, then they probably don’t use this backup procedure anyway, so it’s possible you could get away with it.

Back in the day, hemp food items could be enough to register a false positive on a drug test. After this was becoming a problem, however, the hemp industry increased their limits and standards, and now anything you find in the grocery store won’t even be picked up by a drug test.

Some people attempt to use the “secondhand” smoke of marijuana to be the reason for their positive results. This is so unlikely,  that it will never be believed. In order to have been exposed to enough secondhand smoke from marijuana smokers to have it give you a positive drug test result, you would need to have been in a sealed location with half a dozen smokers for numerous hours. Plus, all of them must be smoking heavily the entire time. Sometimes, however, people do consume the odd marijuana-based edible treat, such as at a party. Whether this will be an acceptable excuse to your employer, remains to be seen.

Get a Marinol prescription before the marijuana test
cannabis drug test
Clean out before the cannabis drug test

Marinol prescription

Like marijuana, Marinol has high levels of THC and, therefore, a legal prescription for it should be enough to account for the levels of THC in your urine. Despite Marinol being FDA approved medication, you are required to inform your employer of your use of Marinol before the test. One way to inform them is by listing it when you list any prescription drugs that you are currently taking. Occasionally employers won’t even let their employees operate while taking Marinol, under the justification that it makes you unfit to work, so be sure to know your employer’s policy for such things.

Technology has undergone some upgrades, and nowadays testing is getting more precise. This means that some tests are emerging which can distinguish the difference between marijuana and Marinol, so this technique needs to be used with caution.

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Clean it out

The most effective way to pass the urine test is to stop the consumption of marijuana beforehand. Some places of employment have random drug testing, of course, in which case you will not be able to plan it this way ahead of time. Pre-employment drug tests, however, should enable you to have enough time to flush out your system.

There is no set rule on how long before the test you need to stop smoking. If you smoke once, 2-4 days before the test, it probably won’t be picked up. People who smoke on a daily basis, however, have a build up in their system that will require a longer amount of time to clean out. Aim for 2-3 weeks without any marijuana, with one full month being the only way to ensure that it is not picked up. In rare cases, frequent, heavy users have tested positive as long as two months after they stopped smoking.

Companies like Testclear have products that, according to them, make you pass a drug test. 
Or you can try some of the detox products that are out there. They aim to flush your system which may help.


Some people try the method of diluting their urine, either through drinking lots of water just before the test or taking a diuretic beforehand. While these could indeed dilute the urine, this can only go so far. If urine is too watery, the labs will probably know. It will be rejected in this case, which means they will most likely ask you to retake the test. Dilution is not a good method to rely on.

Substituting clean urine for cannabis drug testing
Tampering with cannabis drug test
Chemical adulterants eye drops

Tampering with the urine sample

If you are truly desperate, you can try tampering with the results. Proceed with caution, however, as people are expecting a certain number of tamperers to try something. The most common way is to have clean urine with you. It needs to remain warm (between 90 and 98.5 degrees Fahrenheit) to be effective. You can get it from a friend or even buy it from a company online, although some states don’t allow it.

Many people swear by the method of bringing a container (generally something flexible, like a balloon) filled with their friend’s urine and transporting it within their underpants so as not to be found out. They then pour the urine into the cup and handed that cup as their own. The key is to keep the container with you afterward so there is no evidence and to bring something like a nail clipper to puncture a hole in the urine containing balloon.

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Some desperate test takers use a chemical adulterant to change the composition of their urine sample. Although these are detectable, they are often not detected because labs don’t have the money to thoroughly check every sample in this way. False negatives could possibly be achieved by the use of bleach, vinegar, ascorbic acid, salt, soap, and even eye drops. In fact, eye drops are the most effective option and often go undetected — not including adulterants manufactured specifically for this cause. Chemical adulterant companies boast high success rates with their clients.

Blood tests are most often used to check into a drivers’ conditions after a car accident to see if they were under the influence. People are considered ‘impaired’ when they have a THC level of more than 3.5 to 5 ng/mL, which are most common within the hour after smoking. People who have built up a tolerance due to frequent use will most likely not be impaired at this level, however.

There are several products on the market that claim to help you pass a drug blood, like

Despite these facts and studies, some states are trying to establish a zero-tolerance law for driving with marijuana in your system. Others are just trying to establish a numerical limit of some sort, despite the fact that people with a higher tolerance will not be hindered by reaching this limit. Incredibly, there have even been studies to show a person with ADHD could not pass a driving test without having marijuana in his or her system. Therefore, marijuana and alcohol should not be considered to have similar effects on driving. Read more about blood drug testing in Facts About Marijuana Blood Drug Testing.


There are shampoos available that specifically help marijuana smokers pass hair drug tests. They do a fair job of removing external residue from drugs, but, unfortunately, the metabolites themselves were built into the follicles of the hair and, therefore, cannot be removed. They are located within the shaft of hair instead of the outside, making it (so far) impossible to separate the metabolites from the hair. Therefore, shampoos are not proven to be a reliable way to pass a drug test. Read more about hair testing in Hair Drug Testing For Marijuana.

Saliva tests are quite difficult to adulterate. People are generally tested on-site by the employers, so you can’t simply switch it out with another person’s ‘clean’ saliva. You can do a few things to help ensure that you pass the test, should you ever be ambushed with one. One suggestion from marijuana smokers who use prevention as their main weapon against saliva drug tests is always to carry some sort of mouthwash type of item with you. Keep it in your backpack, store it in your desk drawer at work, or put it in another convenient location that will always be reachable.

There are some specific types of mouthwashes, such as Ultra Kleen Saliva Cleansing Mouth Wash, or Supreme Klean Saliva Detox Mouthwash. Either one of these should perform a ‘detox’ of your saliva right away, and will keep it ‘clean’ for an hour afterward. This should effectively allow you to pass a surprise saliva drug test.

Urine is clearly the trickiest test of them all, as it detects marijuana for up to a month (and occasionally even longer) after a person’s last use. In the case of marijuana users, it is rather unfair because other drugs (meth, heroin, cocaine, and alcohol, to name a few) are not detected for as long.  Alcohol, in particular, is difficult to detect and is generally not tested for in the workplace.

A urinalysis doesn’t actually measure the THC in the urine, but rather the psychoactive cannabinoid metabolites that remain after the high from the THC has disappeared. The levels of the metabolites increase steadily for a few hours right after smoking, and then very slowly decrease over time. Generally, this requires several days for people who don’t smoke more than a couple times per week. For frequent users, however, it will require several weeks since the cannabinoids and metabolites both build up within the fat of the body over time.

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The strange thing about urine testing is that no studies show that its detection of the metabolites actually indicates a person’s current level of intoxication from the marijuana. It only shows that a person has smoked marijuana in the past several weeks. In any case, they are still used as an excuse to fire someone or prevent them from working.

Urine drug tests are not able to detect the difference between the occasional, previous use and current, impairing use. Despite that fact, the testing goes on everywhere and as frequently as ever. In reality, feces is where most of the THC in the body is deposited, but drug companies are unsure of whether this is a testing market worth pursuing or not. For everyone’s sake, let’s hope not.If you like more tips for flushing mj out of your system check out this article.

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Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible.


FAQ About Passing Drug Tests

How long can you detect drugs in urine?

Urine tests can detect marijuana for up to a month (and occasionally even longer) after a person’s last use.

How long is marijuana detectable in your saliva?

Saliva testing in occasional users can detect marijuana for up to 3 days after last use and up to a month for frequent users.

How long does marijuana stay in your hair?

Marijuana stays detectable in your hair much much longer than it does in urine or saliva, and is dependent on how long your hair has been growing for.

The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


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  1. By khaled ,04 Oct 2015
    You have entered the plants in a 30-day-old ... and noted that he got slow growth and a small bloomed as I want to understand what is the shortest time to take them from the vegetative to flowering
  2. By latewood ,05 Oct 2015
    khaled I cannot understand your question. This is also Off-Topic. I suggest you join our Support forum, and we can try to help you out.
  3. By Marijuana Saliva Drug Test ,06 Oct 2015
    […] it is a relatively new type of drug test, but it provides some clear advantages over the classic ‘pee into a cup’ […]
  4. By How Long Does Marijuana Stay In Your Body? ,06 Oct 2015
    […] a urine test There are lots of methods employed by marijuana users who need to pass a marijuana test. Some work, others probably don’t at all. Some products called ‘urine cleansers’ are worthy […]
  5. By How to Pass a Marijuana Drug Test ,17 Oct 2015
    […] By Robert Bergman, […]
  6. By Diane ,26 Nov 2015
    I thought this article was supposed to tell us HOW to pass a drug test? The only thing I got out of it is to STOP smoking at least a MONTH before a test. Where is the "real information" on […]Read More
    1. By Beth ,14 Aug 2018
      I agree! Yeah, just stop smoking it at least a month ahead of the drug test! That's all I'm got out of it too!
  7. By latewood.ILGM ,27 Nov 2015
    Diane, There is no guaranteed magic formula to allow you to continue use of THC, and pass a drug test. Drug tests are improving and many now detect the minerals in supplemental drinks claiming to detox you in an hour. […]Read More
  8. By Mike ,02 Dec 2015
    Thank you for all the incredibly helpful information on your site.
  9. By Tim shankle ,03 Dec 2015
    Niacin and midol together work extremely well. Midol is a diuretic and the niacin flushes you. Take 2 1000mg. Niacin 2 days before and repeat the night before your test. Midol same dosage. You'll get red and feel like a […]Read More
      1. By Melinda Stevens ,21 Jun 2017
        USB. Urine, saliva, blood. That is the name of a very trusted product. Lab tested (just like my bodily fluids) lol
  10. By Hair Drug Testing For Marijuana – I Love Growing Marijuana ,15 Feb 2016
    […] When an employer wants to know if you are a short term drug user, they will still perform blood and urine tests. There is a chance that hair drug testing will reveal someone who only uses from time to […]Read More
  11. By thomas ,19 Mar 2016
    I have cancer and have been prescibed Marinol now I'm also on probation my Dr was going to give me medical marijuana but in illinois you cannot have a medical pot card if you have a felony possession in your […]Read More
    1. By latewood.ILGM ,23 Mar 2016
      thomas, I am sad to hear of your Dilemma. I believe that Marinol would test positive in a urine test. Other than that, I cannot advise you on laws and the legal issues you have. I would consider contacting NORML […]Read More
  12. By Anne ,21 Jun 2017
    I smoke street marijuana occasionally, maybe once a week and only a few hits.I now am getting medical marijuana for chronic pain. Will the two forms show up on my urine drug testing at my pain management clinic? Can they […]Read More
    1. By Roy ILGM ,22 Jun 2017
      Hi Anne, your urine will test positive for marijuana but it won't show the difference between your medically required marijuana or otherwise.
  13. By Rowland Mitchell ,09 Nov 2017
    I would like to tell you thanks for all your gueids good seed unlucky for me they spotted my three plants from helicopter and I got busted seed was chocolope and was about ten foot tall
  14. By Brent Boggs ,05 Dec 2017
    I go to the pain clinic because I'm paralyzed and I have been smoking cannabis how do I pass a saliva drug test for THC I have 2 weeks before my appointment
    1. By Jenny Newman ,06 Jul 2018
      Eat ice, lots and lots of ice, 30,min the whole time til you get there! Then throw in spearamint gum and let your mouth water from the gum and use that saliva! Make sure you eat lots of ice before […]Read More
    2. By Jenny Newman ,06 Jul 2018
      Brent Boggs, my bad I just seen how old your post was! How did your test go?
  15. By Mac Watson ,14 Aug 2018
    Hello Robert Bergman. Your blog describes How To Pass A Marijuana Drug Test in human body. This is really a informative blog that can help us future experiment. Thanks, Mac Watson
  16. By Shawn ,03 Nov 2018
    Totally false information. Number one. Don't rely on anybody's advice. Purchase at home tests and test yourself. Not once. Get a fifteen pack at Amazon. Yes.....they are accurate. Most labs test at a cutoff level which is generally 50 nl. […]Read More

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