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Trichinosis? Really? That hasn't been a problem to even be in the back of the most paranoid food safety person in the US in 40 years.The big thing with pigs is trichinosis. Eating animals infected with trichinosis will cause your pork to need cooking. Most of the general populace can't be trusted to cook their pork before eating it, so "animal by-product free" adds an extra layer of food safety in some people's minds. The reality is that mice and rats are huge trichinosis carriers, and there really is no guarantee that infected rat or mouse parts won't end up in hog feed no matter what type of operation it is.
https://www.cdc.gov/mmWr/preview/mmwrhtml/ss6401a1.htm