Comment by awakeasleep

In the threads I see people focusing on the origin of the contaminated material. I think that misses the point that you have to deal with this by testing at the point where the ingredients are assembled into a final product, because it can’t be removed from whatever feed stock creates the individual ingredients.

Of course, ideally the manufacturer of the component ingredient also does the testing but in manufacturing you never trust your suppliers- you need your own testing engineers if you are putting your brand on the product and taking responsibility for it.