We made several trips to Mexico over the years and almost bought property there. When walking in certain areas where crops were being grown, they smell like a city sewer system, only worse. I always wondered who ate the crops that grew there. Maybe in was grown for and by locals, who had built up a tolerance to whatever pathogens had to be present. When I can't grow it here I sure read my labels. No grown in Mexico veggies for us! I never made the connection of illegals and food contamination, but it sure can be true.