Cannabidiol (CBD) shouldn’t show up on a drug test, but many CBD products contain trace amounts of Trusted Source of delta-9-tetrahydrocannabinol (THC), marijuana’s main active ingredient. If enough THC is present, it will show up on a drug test. This means that in rare cases, using CBD might lead to a positive drug test. It all depends on the product’s quality and composition. Detection windows vary a lot according to dose and frequency of use. In general, THC is detectable in urine for approximately 3 to 15 days after use. Heaver, more frequent use can lead to longer detection windows.