CBD and THC, of course, come from exactly the same plant, so it’s understandable why there’s likely to be some cross-contamination. A 2019 study found that 21% of CBD oils purchased online contain detectable amounts of THC, so if you are getting drug tested, taking CBD oil is not a good idea, especially given how long THC can remain in your system (13).

Is CBD Legal? Marijuana-derived CBD products are illegal on the federal level, but are legal under some state laws. Hemp-derived CBD products (with less than 0.3 percent THC) are legal on the federal level, but are still illegal under some state laws. Check your state's laws and those of anywhere you travel. Keep in mind that nonprescription CBD products are not FDA-approved, and may be inaccurately labeled.
When it comes to buying CBD oil, you must be exceedingly cautious because there is a tremendous amount of misinformation and outright deceit within the industry. Many online resources may try to mislead you for profit or other disingenuous reasons. For instance, some Cannabidiol oil companies advertise that their products contain a specific concentration of CBD (displayed in either percentages or milligrams (mg). However, independent research has shown that many of these sellers and their products do not live up to their claims as their products contain far less CBD than they state in print. The Food and Drug Administration (FDA) issued warning letters to specific companies in 2016 because their products were found to contain far less CBD than advertised.
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