When it comes to drug tests, CBD, CBG and CBN aren't what they’re looking for. That being said, if your hemp product also has THC in it, that can negatively affect your drug test. According to the Mayo Clinic, THC metabolites can be detected in urine and show up on a drug test for as long as 15 days after administration. That being said, it really depends on the dose you took and your overall frequency of use.