Not to mention that all the leafy green recalls, such as E. Coli in the lettuce this January [1] and salmonella in the spinach last September [2]. This happens every few months, and has for as long as I can remember.
E. Coli comes from faecal contamination so someone's been pooping in America's leafy greens for years. Not sure there's a whole lot of moral high-ground there.