You might have read rumors online that stomach acid can turn CBD into THC. That’s possible but unlikely, according to the experts we consulted.
Mouth swabs don’t check for CBD—again, they’re checking for THC, said Sample. So no, CBD won’t show up on a standard workplace drug test mouth swab. THC will, though, so keep off large amounts of CBD with trace levels of THC.
At the other end, you could theoretically take CBD hemp oil for months, at low amounts (50 mg/day), and never fail a urine screen for THC-COOH. It’s not clear how much CBD hemp oil is needed—or for how long—to end up with more than 50 ng/ml of THC-COOH in your urine. But certainly, if you’re taking large amounts of CBD, depending on the source, you could test positive for THC.
Can stomach acid turn CBD into THC?
Beyond your CBD source, dosage, length of use, personal chemistry, and other factors determine drug test success or failure.
Workers who use a lot of CBD (cannabidiol) for pain, anxiety, insomnia, or a host of other symptoms, can accidentally (and unfairly) fail drug tests for cannabis in certain cases, media and experts report.
Oral fluid testing is uncommon. In 2018, general workforce testing included over 6 million urine screens, versus just 1.3 million oral fluid tests, and 200,000 hair follicle tests.
“It’s caveat emptor,” said Barry Sample, Ph.D., senior director of science and technology for employer solutions at the nation’s biggest drug testing company, Quest Diagnostics. “The real issue is, how do you trust the labeling?”
While it may be uncommon for anyone to screen for the presence of CBD, does a CBD oil drug test even exist? Technically, since CBD is a chemical that your body metabolizes, a specific test can be developed to detect it. But the average drug test will not identify any usage of CBD oil.
There are also different types of drug tests that can be used, all of which present different detection thresholds. For instance, a hair test is made to detect habitual substance use, so it will probably not raise any red flags even if you are consuming CBD oil that has low levels of THC.
“Buy from reputable forms that are third-party tested that have batch numbers, lot numbers, and retained batch samples. If they claim that either that their plants are genetically engineered for no THC or they use methods that purge THC, to make sure that that’s third-party validated,” Morgan said.
But how can you tell how much THC, if any, might reside inside your CBD oil? Can you really trust everything the label on the side of the bottle? The safest bet is to look for well-known CBD products that are independently tested.
Cannabidiol (CBD) has recently surged into the therapeutic spotlight for its perceived anti-inflammatory, anti-anxiety, pain-relieving, and seizure-suppressing properties. It can be found in health and wellness aisles across the world — perhaps even at your local Walgreens or CVS — and comes in many forms, some of which include CBD oil, tinctures, edibles, elixirs, and more.
Urine and oral drug screenings have a lower threshold for detection, so there is slightly more risk with these tests, according to a December 2018 article published in Vice. While it’s possible that the small amounts of THC that exist within a CBD product could accumulate and show up in a drug test, it’s still highly unlikely.
Although hemp-derived CBD products are available in states where recreational cannabis isn’t legal, some people might worry whether their use of CBD oil will show up on a drug test. Even in states where it is legal to buy THC-heavy cannabis from a retail store, some employers still screen employees for cannabis use. It’s a valid concern considering that even CBD products derived from hemp are legally permitted to contain traces of THC, 0.3% or less to be exact, perhaps leaving some consumers to wonder whether there’s a small amount of THC in their CBD oil — and whether that will show up on a drug test.
Sample, at Quest Diagnostics, says that chronic, heavy users of marijuana could test positive even a month after they stop using it.
So how can you fail a drug test after taking CBD? The urine test most commonly used doesn’t even look for CBD but instead a compound created by the body when it metabolizes THC, says Barry Sample, senior director of science and technology at Quest Diagnostics, the largest administrator of drug tests in the U.S. “There isn’t going to be a laboratory analytical false positive confusing CBD with a THC metabolite.”
Dixie Elixirs did not respond to a request for a comment.
Small Amounts of THC Can Build Up
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.
Talk with your employer. That’s what worked for J.C., in Nevada, after he tested positive for marijuana use. Armed with documentation from his doctor that he was taking CBD to treat anxiety and insomnia, he met with company co-founder Matt Ross, chief operating officer of the Slumber Yard—a website that tracks user experiences with buying and using mattresses—and explained why he was taking it. He even took the bottle in for his employer to see.
Other states, such as likeCalifornia, Montana, Oregon, and Washington have laws to assure that companies located in those states do not have to provide “reasonable accommodations” for people who use medical marijuana, and leave it up to each employer to decide, Reidy says. In those states, though, it’s still worth asking your company’s HR department about it if you’ve failed a drug test for marijuana after taking CBD.
“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.”