Yeah, I did microbial testing for food qa years ago (packaged and raw foods) and very rarely did I ever see a positive result. But heavy metals were
everywhere in raw foods, especially cadmium and arsenic.
People utilizing unusual or previously abandoned spaces in their yards (the strip between the sidewalk and street, near their garage, their driveway

) are a hotbed of metals. Plants fucking soak that shit up
E: though in my city, the people who do plant veg in unusual spots deserve metals poisoning