The Food and Drug Administration (FDA) has established maximum levels of natural or unavoidable defects in foods for human use that present no health hazard. These "Food Defect Action Levels" listed here are set on this premise--that they pose no inherent hazard to health.
Here are the hazardous levels;
Allspice: Average of 30 or more insect fragments per 10 grams, Average of 1 or more rodent hairs per 10 grams
Berries: Average of 4 or more larvae per 500 grams or Average of 10 or more whole insects or equivalent per 500 grams (excluding thrips, aphids and mites)
Frozen Broccoli: Average of 60 or more aphids and/or thrips and/or mites per 100 grams
Ground Paprika: Average mold count is more than 20%, Average of more than 75 insect fragments per 25 grams, Average of more than 11 rodent hairs per 25 grams
Ground Cinnamon: Average of 400 or more insect fragments per 50 gram, Average of 11 or more rodent hairs per 50 grams
Chocolate: Average is 60 or more insect fragments per 100 grams when 6 100-gram subsamples are examined or
Any 1 subsample contains 90 or more insect fragments, Average is 1 or more rodent hairs per 100 grams in 6 100-gram subsamples examined or Any 1 subsample contains 3 or more rodent hairs
Canned Citrus Juice: Average mold count is 10% or more, 5 or more Drosophila and other fly eggs per 250 ml or 1 or more maggots per 250 ml
Red Fish and Ocean Perch: 3 % of the fillets examined contain 1 or more copepods accompanied by pus pockets
Hops: Average of more than 2,500 aphids per 10 grams
Macaroni and Noodle Products: Average of 225 insect fragments or more per 225 grams in 6 or more subsamples, Average of 4.5 rodent hairs or more per 225 grams in 6 or more subsamples
Popcorn: 1 or more rodent excreta pellets are found in 1 or more subsamples, and 1 or more rodent hairs are found in 2 or more other subsamples or 2 or more rodent hairs per pound and rodent hair is found in 50% or more of the subsamples or 20 or more gnawed grains per pound and rodent hair is found in 50% or more of the subsamples
There are more items listed, these are just a few. We have been ingesting these things for some time, but the thought of rodent poop in our popcorn is just a bit much.