I had read this quote from a German supplier of herbal stuff and things like that. In Germany (Europe in general I think) the stuff he sells is classified as a drug. So it's topnotch stuff. We all know the Germans make topnotch stuff anyway
Everything is done exacting so his ingredients are more expensive. He said most companies never order them in America because they just want the cheapest one. He visits many companies and he said pretty much none of them (that he visits) check the incoming stuff in any way. Including no check of the containers which are frequently a source of cross contamination.