Zero should mean zero. Often, CBD companies that claim their products are THC free or zero THC in fact don't mean that; what they mean is their products are below the 0.3 legal requirement for THC.  There are no national standards or oversight for testing or labeling of CBD products in the U.S. According to a recent study performed by the non-profit consumer advocacy organization the Clean Label Project, “100% of full spectrum products making THC-free claims actually contained THC” 242 total products were tested in their study and THC was one of many contaminants found that were either not listed or mislabeled. There is a growing body of independent third party research showing that, not only is the labeling of CBD products inconsistent, but more alarmingly intentionally misleading and in many cases hiding high amounts of THC. In the U.S. Almost 60% of employers require a drug screening prior to or during employment. THC exposure can stay in your system for weeks and months and can build on earlier exposure leading to a positive drug test result. Many CBD brands provide disclaimers of THC exposure on products labeled ‘zero” THC. With answers referencing individual metabolism, or the conversions of cannabinoids in one's body, and or tell you to consult a physician before use. Further, many claim that the inclusion of THC makes the product more effective. However there is little scientific data to support the hypothesis that the entourage effect is more than a creative marketing effort. In fact there is a significant amount of peer reviewed published evidence suggesting that it is at best still hypothetical. The theory that THC is necessary or that a myriad of other unknown chemical compounds that are in unmeasured and present in inconsistent quantities can have an effect doesn't make sense logically, anecdotally or scientifically. If the ingredients are different every time, how can the effect be reliable, consistent or safe? Cannabinoid products need to be measured, consistent and reliable and labeling should be truthful and accurate.  Zero should mean Zero.