CBD oil should not cause you to test positive for cannabis on a drug test.
Drug tests that screen for THC may work in different ways, depending on the application. For example, roadside tests used by the police, rely on testing kits that use swabs to test the saliva for the presence of THC molecules that can be found specifically in the mouth. Workplace testing often relies on urine samples to detect the presence of THC metabolites.
UK regulated CBD products must adhere to strict regulations around the permitted THC limit which is currently 0.2% - so it is incredibly unlikely that you will surpass the threshold of a standard drug test. With that said, it is vital that you purchase from a legitimate and regulated CBD seller, as unregulated CBD oils have been shown to contain between 5-10% THC content which will likely result in a positive test, should a drug test be taken. Our products are all submitted through thorough lab batch testing to ensure not only consistency in quality but in adherence to UK regulations.