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.
CBD has taken off as a natural remedy for a variety of ailments. CBD products like CBD oil can be made from either the hemp plant or the cannabis plant, which are closely related varieties of the same cannabis species, Cannabis sativa. CBD products contain a cannabinoid—a chemical—called cannabidiol, which does not make you high. The substance in marijuana that causes a buzz is a different cannabinoid, called THC, or tetrahydrocannabinol.
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
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.)
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:
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.
CBD will not show up in a drug test because drug tests are not screening for it. CBD products may well contain THC, however, so you can fail a drug test after taking CBD products. If you take CBD oil, you should plan accordingly if your work or activities require you to undergo drug testing.
If you have any documentation from a medical provider, that can help, too. And you may have more luck if you live in Arizona, Arkansas, Connecticut, Delaware, Illinois, Maine, Massachusetts, Minnesota, New York, Pennsylvania, or West Virginia. Those states have passed laws providing some protection for people who use medical marijuana, potentially including CBD, Reidy says.
“I wasn’t familiar with CBD at the time,” Ross says. But he and his partner appreciated that J.C. addressed the situation. “He was really talented as a video editor, and we felt comfortable enough to get past it.”
And once CBD is turned into a “finished” product, such as an oil, a lotion, a tincture, a pill, or a vape liquid, few states dictate how those should be tested for THC, save for Oregon and soon Vermont. State agriculture departments, DeLucia says, don’t have jurisdiction over testing these products for safety.
Small Amounts of THC Can Build Up
CBD products often have more THC than claimed, research suggests. For example, a 2017 study in JAMA found that 18 of 84 CBD products, all purchased online, had THC levels possibly high enough to cause intoxication or impairment.
Koi CBD told Consumer Reports in a statement about the lawsuit: “Koi prides itself on providing the highest-quality products while being a leader in the industry. We take claims regarding our products very seriously. We are investigating this matter and the allegations, which at this time, are unproven and unverified. We remain focused on continuing to carefully craft and offer a full array of beneficial cannabinoid products.”
Last, some states allow medical CBD products obtained through permitted channels to contain more than 0.3 percent THC. For example, the cutoff in Georgia and Virginia is 5 percent, Sample says, a level that is definitely high enough to cause impairment and a failed drug test.
Best bet: To increase the likelihood that a product doesn’t have more THC than claimed, look for a manufacturer that can provide a Certificate of Analysis, or COA, for its product. That document shows the results of a company’s testing for THC, CBD, and various contaminants. Though that testing is voluntary (except in Indiana and Utah) and the results aren’t confirmed by independent experts, for now it’s the best information available. If a store or website can’t provide you with a COA, look for another product. Read more about how CBD products are tested.