Have you failed a drug test that your employer or a potential employer required? Do you believe that your results are incorrect? If yes, you should know how to dispute a false positive drug test. You can take steps to argue the findings, such as establishing why you received a false positive result. You might also ask the employer to re-test.
In this post, we explain drug testing in the workplace. We consider the likelihood of false positives and their causes, depending on the type of drug test. We’ll also examine what steps you can take to rectify the situation. Employers must also understand these concerns. Please refer to our dedicated guide for more on what employers need to know about drug testing.
Any test that indicates a positive result when it shouldn’t. Such a test may indicate that someone has drugs in their system despite a lack of evidence of recent use. During random drug testing, an individual who has never used illegal drugs could test positive. False positives can have a severe impact on employment opportunities. Some employers use drug testing as a pre-employment requirement. Others test continually after hiring to maintain drug-free workplace policies.
Due to various factors, these tests are not always accurate, even though they apply advanced science. Such tools include gas chromatography and mass spectrometry. Some medications and even foods can resemble drugs to these tools. These mistakes cause positive results even if the subject has not used any illegal drugs. A drug test can’t always distinguish between specific molecules in your bloodstream. They may look chemically similar to illicit drugs. False positives may occur for substances such as marijuana, amphetamines, opioids, and many others.
The good news is that predicting when a drug test might lead to a false positive is often possible. You should know beforehand what substances may flag positive drug test results. For instance, you may encounter issues using one of the medications listed here in some types of tests.
Some painkillers and NSAIDs (Nonsteroidal Anti-inflammatory Drugs) can cause false positive test results. These include some common “over-the-counter” pain relievers. Examples include Advil and Aleve. These drugs may cause a subject to test positive for THC, PCP, or barbiturates. Arthritis drugs such as Daypro can cause false positives for benzodiazepines.
Some antibiotics can cause a false positive test for opiates. Examples include Cipro and Levaquin, often prescribed to treat various infections. If you’re completing an antibiotics course, inform the lab collecting your drug sample during the screening test.
Prozac, Effexor, and other common antidepressant drugs can cause false positives, too. These prescriptions may appear on a drug test as LSD or amphetamines.
Antihistamines are medications that treat allergies or hay fever. These drugs, such as Benadryl, will sometimes show false positives for methadone or PCP. Some sleep medications will have the same impact on drug screening. Diphenhydramine, better known as Benadryl, may cause a false positive.
Prescription medications that treat ADHD, such as Ritalin or Adderall, can lead to positive results for opiates and amphetamines.
Cough syrups are a medication for the common cold. They can also cause false positives in drug testing. The active ingredient in many over-the-counter cough suppressants is dextromethorphan. The drug testing process may identify this ingredient as an opiate or PCP.
Sudafed is another common cold medication. Its active ingredient, pseudoephedrine, can play a part in the production of methamphetamine, and it’s no longer an over-the-counter drug. Customers can still buy these products without a prescription, but a controlled process exists due to its side effects. Consumers must go to the pharmacy counter, show their photo ID, and sign a ledger as the precautions aim to curb meth production.
Some medications that treat acid reflux disease and digestive conditions can lead to false positive drug tests for marijuana, including the popular OTC and prescription drug Nexium.
Medications aren’t the only substances that can produce a false positive on a test for drug use. Several other elements can cause problems. Some or all of these might be in your medicine cabinet or kitchen and include:
Vitamin B2 (riboflavin) is beneficial for healthy body growth, the production of red blood cells, and more. It can also cause you to fail a drug test. Some riboflavin or B2 supplements come from hemp seed oil. Hemp seeds are part of the marijuana plant. As a result, some B2 vitamins can cause a false positive for marijuana use.
CBD is also derived from marijuana. People use CBD for many things, such as pain management or as a sleep aid. CBD has gained immense popularity in recent years. While it is non-psychoactive and cannot get you “high,” it still originates from a similar plant. As such, it could still put traces of THC in your bloodstream or urine sample, causing a failed drug test.
One of the most well-known causes of a false positive drug screening is the poppy seed. This topping is common on muffins, bagels, and other foods. However, poppy seeds come from the same plant used to make opium. Consuming poppy seeds before a drug test can lead a subject to test positive for an illicit drug.
These products may contain alcohol. When you use them consistently, they can leave trace amounts of alcohol in your bloodstream. In most cases, there is nothing to worry about: standard drug tests don’t test for alcohol. If a subject needs an alcohol test and shows zero traces of alcohol in their body, these products can potentially cause problems.
Tonic water, a common ingredient in cocktails, can lead to a false positive drug test. It contains quinine, initially developed as a drug to treat malaria. Quinine only appears in tonic in low quantities, so it usually isn’t a problem. However, it has the potential to trigger a false positive drug test result for opiates. Copious consumption could cause such a result.
Are you concerned that you’re at risk of a false positive drug test? Do you believe you’ve already failed a drug test based on a false positive? Take the following steps to seek a resolution for the issue.
Notify the lab or medical official conducting a drug test of potential problems beforehand. For example, do you regularly eat poppy seeds or take B2 supplements? Do you take CBD? If so, you should alert the testing agent before you submit a sample. If you have documentation to support your claim, provide it. These steps could help you avoid a false positive.
If you’ve already failed a drug test, consider what might have caused the issue. The most critical step here is self-reflection. Think about what you’ve consumed recently. Review everything that could be to blame, including food, drink, and medication.
If you did take a medication in the days leading up to the drug test, ask your doctor or pharmacist if that could cause a false positive. If they concur, they can vouch for you with a prospective employer.
If you can, offer strong evidence for why your positive drug test might have been a false positive. Ask for a second test. For instance, if you apply for a job and are a strong candidate, you may receive a conditional job offer. That offer might be partially contingent on your drug test result. If you explain the potential circumstances, that employer should let you test again for the correct results.