
The answer is "no" unless you take a specific bottle to be tested by an independent lab. Then you'd need to do the same with the very next bottle you purchase (even if it's the same brand). And so on.
I am including 3 links to articles about the problems with putting hope + faith in scientifically unproven, unregulated supplements like CBD oil. Please make sure you speak with your physician before adding it to your diet so they can be aware of any interaction with any other medications you are taking.
FYI people are failing drug tests because not all of the THC is completely removed by the manufacturers! Also, dosages can vary from what the labels indicate. The CBD industry has been called the "Wild West" as tens of thousands of suppliers and sellers jump into the very lucrative fray. It's bad enough that numerous Attorneys General are lobbying for it to be regulated by the FDA.
https://www.cbsnews.com/news/cbd-cbs-news-tests-cannabidiol-products-for-cbd-thc-and-impurities-dosages/
https://wjla.com/features/7-on-your-side/investigations/consumers-claiming-positive-drug-test-after-cbd-oil
https://abc7chicago.com/health/cbd-tested-whats-in-the-popular-products-and-is-there-thc/5571957/
She has ADD so she takes meds for that and she went to her psychiatrist to make sure she could mix them.
The psychiatrist told her that it was fine to use CBD with her ADD meds and that some of his patients did well on CBD oil and others saw no real difference.
There is independent lab testing and a reputable dispensary is your best way to try this stuff; some people have had good results with it.
The worst thing about CBD in MY book is that it can have a profound affect on other medications you take, making them work BETTER. Now some might say that is good, but it isn't. Think of thyroid medication. It is fine tuned by your blood work for the dose. And too much of a good thing can be a bad thing.
Thanks for posting some articles for folks to plow on through to get more information. We tend to bite on "trends" without doing due diligence in research.