I worked in the CBD Industry since its inception. I ran my own CBD business. I know more about this than you do. While CBD regulations are incredibly lax, there are quality CBD products you can find, and it behooves the CBD consumer that doesn’t want to test positive for THC to read the label and check out the company. Much like someone with a nut allergy, you’re gonna have to read the package.
CBD is put into products predominantly in one of 3 forms. Crude oil (which will have some THC in it), Distillate (Trace amounts of THC), and Isolate (typically 97-99% pure). If you’re ingesting the product like through an oil tincture, gummies, or other edible product, and it’s CBD content it derived from the addition of crude oil or distillate, you’re going to have trace THC. If it’s from isolate, you won’t.
However, that THC content is only a concern if you’re ingesting the product. THC isn’t water soluble, so it won’t be absorbed by your skin, unlike CBD. Any topical CBD product will have no risk of THC exposure.