There were people breaking out in rashes awhile back that were allergic to penicillin but hadn't had any. They got it from milk. Look at all the stuff on our food. I once asked a grocery why the apples were so red and shiny. He said they washed them with a wax. No tell what you can get from a can good if you don't wash the top first.
Yes, I think you are right about that. Chemicals and anti biotics in everything we buy to eat. And pesticides sprayed on everything to boot.
two words...rat pee.