Much of the data we have about CBD is anecdotal, and its potential impact on drug testing is no exception.  There are very few peer-reviewed studies on the subject, but there appears to be a small risk of a false positive for some users. Avoiding full-spectrum products containing traces of THC can reduce your risk of a false positive, but that may not eliminate the risk entirely. 
But, CBD also has amazing potential when the product is created from the cannabis indica or sativa varieties with the proper extraction processes. A recent study from Israel showed that CBD in its natural form as a whole plant extract is superior over a single, synthetic CBD compound for treating illness. The plant has continually outperformed synthetic versions in research studies.