This would only be of substances already approved for general use, and wouldn't expose anyone to any substance they wouldn't otherwise be buying/using. The onl

This would only be of substances already approved for general use, and wouldn't expose anyone to any substance they wouldn't otherwise be buying/using. The only difference is it very slightly adjusts the quantity - and does so in a way that is within existing allowed tolerances, so effectively this might already be happening, just we aren't collecting the results.