How to pass a mouth swab drug test for weed at Amazon or any other company

What Is a Mouth Swab Drug Test?

A mouth swab drug test is when they swab your mouth to check for recent drug use.  It will detect drug use one hour after use, so if you just used it, you might come up clean.  It will continue to detect drug use for up to 48 hours.  So, it is looking for recent drug use.  Basically, it is checking if you are intoxicated on the job.


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In addition to marijuana, these tests may check for:

As the US is in an opioid epidemic presently, many people may be worried about tests for opioids.  Yes, it will test for opioids like methadone, fentanyl, oxycontin, and heroin.  However, it will only test for oral use.  Nasal use may cause some residues to be deposited in the mouth as well.  It will not test for intravenous use because not many drug residues will make it into the saliva if you are using intravenously. Remember, that you may be checked in multiple ways. In such a case, if you know that your urine or blood may be taken, try a detox drink instead.

oral drug test

Testing process

As you can see from the picture, a medical worker will be putting a swab into your mouth.  She will collect saliva from under the tongue.  The medical worker is not looking for cheek cells, that’s a different kind of test which is used to test for things like HIV.  She does not need your cells, only your saliva.  Results will be available fairly soon with most tests.  If you test positive for anything, the sample may be sent to a lab for confirmation or you may have to submit to further testing.

How long does THC stay in your saliva for a drug test?

THC is the most stubborn drug.  It can stay in the body for 30 days.  However, saliva tests only test for live THC, not THC-COOH, which can be in the saliva at low concentrations had leached from the blood into the saliva.  Therefore, it will only test for marijuana ingested in the last 2 days.  It will not test for marijuana used in patch form, as that will not reach the saliva.  So if you are prescribed medical marijuana and have a saliva drug test, use a patch for your medical issues.

Oral swab drug test THC detection times

Saliva drug test detection times THC chart

how long does weed stay in your saliva

Although drugs may stay in the system or even the mouth for more than 2 days, saliva tests will only find significant concentrations for drugs used in the last two days.


Q:  Which Employers Use Mouth Swab Drug Tests for marijuana and other drugs?
A:  Employers may do this simply as a requirement and they may hope everyone passes.  It only tests for drugs in the last two days and they may give you a heads up so you can stop using drugs for two days.  Others are trying to catch you using drugs on the job and will test you randomly.  Here are the major reasons for a saliva drug test.

  1. For truck driving school.
  2. You got into an accident in the company vehicle.
  3. Doc is giving you medication and needs to make sure you’re not taking something which may interact with it.
  4. A psychiatrist wants to see if he can treat you with scheduled substances like benzodiazepines like clonazepam.  If you test dirty, he will only give you unscheduled drugs like hydroxyzine, an antihistamine used for anxiety.  These treatments may be ineffective, but he has to protect himself from charges of giving drugs to addicts.
  5. When Do Employers Use Mouth Swab Drug Tests for cannabis and illicit drugs?
  • Before you get a job.
  • When you get a promotion.
  • You are going back to a military or police job.
  • You are a cop or a civilian and you have shot someone and they have profiled you and decided you might be high rather than standing your ground.

Tips on how to pass a mouth swab test at work

Check your employee handbook for the drug policy at your job.  They will tell you if you have drug tests, are they random or pre-revealed, and are they supervised or unsupervised.  All oral tests are supervised because the technician must put the swab in your mouth.  Urine tests can be supervised or unsupervised.  Someone of the same sex may watch you pee to make sure you are not cheating.  If they are really serious, especially for men, they may want to see your penis to make sure you aren’t using a fake penis device like a Whizzinator.

Q:  How Long Does Weed Stay in Your System for spit tests?
A:  After 60 minutes and up to 2 days it is detectable.

Q: Does passing the mouth swab test with mouthwash mean my body is clean or detoxed?
A:  No.  You may still have drug residues in the blood, fat cells, urine, and hair.

Q:  What’s the fastest and easiest way to beat swab testing?
A:  Just use a peroxide mouthwash.  Use the regular peroxide you get from the store of low concentration, about 3 percent.  Gargle and swish around the mouth for 60 seconds.  Spit it out.  You should be good to go.  Do it a second time if you like.  Don’t overdo it and have your inner cheeks peeling off.

Pros and cons of swab drug tests

Pros Cons
  • Only tests for drugs used in the last 2 days, so it’s easy to beat by just abstaining from drug use for 2 days.
  • A swab drug test can give same-day results.
  • It tests for a limited range of drugs.
  • The method is not very invasive.
  • It’s hard to cheat cuz the technician puts the swab in your mouth.
  • It’s cheap.
  • It does not check for drug use beyond the 2-day detection window.
  • It can bust you if you have been using drugs during break or on the job.
  • Sometimes they do not make exceptions for medical marijuana.

How to pass an oral swab drug test

Home remedies to pass a saliva drug test

A study of Kleaner mouthwash, milk, and water, detected lower concentrations of THC after the use of water, but not enough to beat the drug test after one rinse.[1]  The others fared less well.  They did not test our home remedies which should have a higher success rate.


Peroxide is the most recommended approach to forums like Reddit.  The substance will oxidize drug residues so it’s a sure shot. Definitely use it.  Brush your teeth then swish with hydrogen peroxide.  They may pop up the test on you at work, so have this in your desk at all times.  If they say you have a test, ask to go to the bathroom real quick.  Take your toothbrush, toothpaste, and a little bottle of hydrogen peroxide and follow the instructions from Reddit below.

peroxide before saliva drug testing reviews


Listerine is also often mentioned. Wondering how to pass a saliva drug test with listerine? The method is quite simple. Make sure the formula you have does not contain alcohol.  Swish it around your mouth with some water for 60 seconds.

Baking soda

Baking soda will neutralize acids in your mouth and may alter the structure of THC.  Use it as you would a regular mouthwash.  Don’t swallow it.

How can I pass a cotton swab drug test with detox products

Stinger Detox Mouthwash – Vanilla Flavor

stinger detox mouthwash

This popular detox mouthwash is available on Amazon.

It contains some sugars and amino acids.  The D-ribose is a sugar contained in DNA, this may disrupt the ability to detect antibodies in a drug test. Some users consider it to be the best detox for saliva drug test.

High Voltage Detox
High Voltage Detox mouthwash
This is another popular detox mouthwash. However, I would say watch out for this one because it does contain alcohol. Therefore, you’re gonna flush your mouth good and get all that alcohol out before your test. Get it from Amazon.

Toxin Rid Rescue Mouthwash
Toxin Rid Rescue Mouthwash
This product can be obtained from  Some people swear by Toxin Rid products.  You wanna swish this around your mouth and spit it out till the whole bottle is gone.

Toxin Rid Rescue Mouthwash review

Federal and State Drug Testing Laws for beating mouth swab analyses for pot and other drugs

In The US, trying to beat a drug test administered by the US government, courts, or agencies like the Department of Transportation is illegal and considered an attempt to defraud the US government.  However, prosecutions for using mouthwashes are highly unlikely.

Many states have laws against detox products.

In Texas and Louisiana, it is illegal to deliver or produce detox products.

It’s illegal to sell detox products in Florida, Kentucky, and New Jersey.

In the following states, adulterants are banned:

  • South Carolina
  • Nebraska
  • Maryland
  • Illinois
  • Arkansas
  • North Carolina
  • Oklahoma
  • Pennsylvania
  • Virginia

Conclusion: the mouth swab drug test detection period is only 2 to 3 days

The best way to beat the saliva drug test is to abstain for two days. The second best way is to use a peroxide mouthwash.  It is better than detox products, which is the third-best way.  Now, you have all the key information on how to pass a mouth swab drug test successfully. Be safe and happy.


[1] “Assessment of different mouthwashes on cannabis oral … – NCBI.” 22 Jan. 2014, Accessed 14 May. 2020.


  • Dr. Joseph Koyner

    Dr. Joseph Koyner is a practitioner MD. He specializes in Addiction Medicine. He is an alumnus of UCCS. Koyner is working as a medical consultant for 15 years. Currently, Dr. Joseph is working as a self-employed specialist in Los Altos, California.