Dr. Malik Burnett is a former surgeon and physician advocate. He also served as executive director of a medical marijuana nonprofit organization. Amanda Reiman, PhD, holds a doctorate in Social Welfare and teaches classes on drug policy at the University of California-Berkeley.
In reality, the only thing that will ensure a clean drug test is abstaining from ingesting drugs, at least for a while, but each test is different in terms of how long you need to abstain and what the test can tell about your use history.
However, depending where you live, there might also be transdermal patches on the market. These work similarly to nicotine patches and do contain components that allow the THC to break into the bloodstream and will cause intoxication and a positive drug test.
Thank you for your question. Topical cannabis applications can be extremely helpful for localized pain and inflammation. Many people like them because they work on contact and are non-psychoactive.
Drug tests can be administered in a discriminatory way that many times includes violations of privacy and an assumption of drug use leading to negative consequences. However, in today’s world, it is a part of many opportunities for employment, athletic participation and part of criminal justice sanctions.
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Think about rubbing alcohol. You can rub it on various places on your body, but you will not feel intoxicated or have a BAC over the legal limit if you use it, even though it has a very high concentration of alcohol in it. However, remember that, like the transdermal patch, consuming marijuana in other ways will show up on a drug test.
CBD products can still be problematic, however, when it comes to drug testing. Though drug tests screen for THC, not CBD, many CBD products contain a trace amount of THC which will be detected in your bloodstream during a drug test.
Topical products that claim to contain CBD—like shampoos, cosmetics or creams—should not cause any reaction during a drug test because they do not enter the bloodstream. In the case of CBD oils, gummies, teas or transdermal patches, the situation is more complicated. In a test of 84 CBD products obtained online, 18 contained THC.
Factors in CBD Oil Showing on Drug Screen
THC can be detected in a urine test for up to 15 days, depending on how often and how much you use. It leaves the bloodstream in about five hours, but substances your body makes from THC (THC metabolites) can show up for as long as 7 days. CBD tends to stay in the bloodstream from 2 to 5 days, depending on dosage and frequency. If you have been using CBD for a while, it can stay in your body for up to 30 days or more.
If you are concerned that THC in your CBD oil or other CBD product may show up on a drug test, you may be able to reduce the chance of that occurring, though there is no guarantee. Some of the factors that may increase the likelihood of a failed drug test are:
The legality of CBD products can be confusing. CBD products made from certain cannabis plant varieties are legal only in states where marijuana is legal, due to the potential THC content. CBD products made from hemp variety plants are legal throughout the United States as long as they contain less than 0.3% of THC and do not make any medical claims. (A hemp plant is defined as Cannabis sativa that contains less than 0.3% THC.)
Researchers found that CBD, or cannabidiol, did not react with either of two commercially available tests used to screen for marijuana use. However, another cannabis compound — cannabinol (CBN) — did.
Legally, Kroner noted, CBD products should only be produced from hemp plants with no more than 0.3% THC. But there’s no way for consumers to know for sure what’s in the products they buy.
The simplest course is to refrain for a while, according to Kroner. But she also advised being up front about your CBD or CBN use — or any supplement use, for that matter — so that your test results can be interpreted in that light.
On the positive side, he noted, immunoassays are only screening tests. They would be followed up by “confirmatory testing” that does distinguish THC from other compounds. But you could still have a problem if your cannabis product was contaminated with THC, Fitzgerald said.
According to Robert Fitzgerald, a professor at the University of California, San Diego’s Center for Advanced Laboratory Medicine, “It would depend on the purity of the product.”