Well, those "poop tubes" are cleaned beforehand, and a loooong tradition ;-)
I also heard some years ago that "Apfelmus" (german for Apple puree, that is quite popular here in industrial form) also has contents of rodents in it, simply because from time to time some mice/rats can enter the apple storage and get acccidentally processed. In fact, it is tolerated, and I do not know if there is a legal limit for it, or if it should not be there at all, but no one really tests for it...