Drug tests for marijuana check for Tetrahydrocannabinol, not CBD. While CBD derived from the hemp plant often contains less than 0.3% THC, hemp-derived CBD extracts from marijuana may contain detectable amounts of Tetrahydrocannabinol. You need to make sure that you purchase an Oil that comes with 3rd-party lab testing so that you know what comes in your bottles like we do at American Hemp Oil. We also add in Hemp Terpenes into our formula to help achieve the entourage effect without having to have THC in our products.