Yes. Hemp oil extract is legal in all 50 states, provided it contains less than 0.3% of THC.
Tests can be conducted to test the percentage of THC in urine. If you are subjected to a POCT or point of care testing or an immunoassay test then there is a possibility that it will be positive for THC.
Because hemp oil extract is made from the same plant species as marijuana immunoassay tests are unable to tell the difference, however, there is not all bad news.
People using hemp oil extract need to inform the testing facility that your using this supplement and that your test needs to be sent to a lab that does Liquid Chromatography Mass Spectrometry (LCMS). LCMS is the gold standard for urine drug testing and is 100% accurate in differentiating people that are using a hemp oil supplement vs people using marijuana with THC in it.