You should only use CBD oil products if you are willing to accept at least some risk of testing positive on a drug test. Not everyone who uses hemp-derived CBD oil tests positive. But it does happen. The risk of testing positive is lower if you're using a broad spectrum or isolate product. These products have non-detectable levels of THC based on manufacturer testing.
So. According to the Controlled Substance Act definition itself, certain parts of the cannabis plant are clearly illegal, while others fall into a grayer area. One of these – for the most part – is CBD extracted from the “legal” parts of the cannabis plant, and non-marijuana industrial hemp plants, which, as defined by Section 7606 of the Farm Bill are cannabis plants with less than 0.3 percent THC.