The principle of not testing chemicals if they appear in food in small enough doses was introduced in 1967 by an industry toxicologist, who based it on a table of 220 chemicals. The table includes studies from a lab later caught faking data. reckoningscience.org/de-minimis-o...
reckoningscience.org
De Minimis, or "Sheer Nonsense"
The origin of the threshold below which a chemical in food need not be tested