The Food Defect Action Levels: Levels of natural or unavoidable defects in foods that present no health hazards for humans is a publication of the United States Food and Drug Administration's Center for Food Safety and Applied Nutrition detailing acceptable levels of food contamination from sources such as maggots, thrips, insect fragments, "foreign matter", mold, rodent hairs, and insect and mammalian feces. The publication details the acceptable amounts of contaminants on a per food basis, listing both the defect source (pre-harvest infection, processing infestation, processing contamination...