In food manufacturing, there is no guaranteed way to prevent all insect or vermin debris from showing up in food. By their very existence, vermin are attracted to food processing plants, and it's difficult to completely or permanently eradicate all pests from sanitary areas.
Here is what the FDA says about it in the USA:
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The FD&C Act and Defect Action Levels Under section 402(a) (3) of the FD&C Act, a food is technically illegal if it contains any insect or rodent filth, mold, rot, or other similar substances. Even with modern technology, few foods are completely free of natural or unavoidable defects. Foreign material cannot be wholly processed out of foods, and levels of many contaminants introduced into foods through the environment can be reduced only by reducing their occurrence in the environment. The FD&C Act, nonetheless, was designed to protect the consuming public from violations to its aesthetic sensibilities as well as from poisonous, filthy, decomposed, and putrid foods and foods prepared under insanitary conditions (Kurtz and Harris, 1962). The food industry must continually strive to minimize natural and unavoidable defects in foods. Federal regulations recognize that even when produced under current good manufacturing practices, some foods contain natural or unavoidable defects at low levels that are not hazardous to health. Currently, the regulations allow FDA to establish maximum levels for such defects in foods produced under current good manufacturing practices and to use these levels, called defect action levels (DALs), as a basis for regulatory actions (Food and Drug Administration, 1998f). New defect action levels are established for products whenever it is necessary and feasible. |
This topic is already covered here: Junk Food Safety
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