The regional produce manager said he would not eat (or feed his family) any form...
...of produce grown in Mexico that rests on, or below, the ground. He trusted the produce that grew above ground, like corn, tomatoes, beans, mangoes, etc., but not melons, strawberries lettuce, cabbage, onions (scallions or bulb varieties), and definitely no root vegetables.
If the irrigation water could touch the actual edible portion, he would not eat it.
I try hard to follow those recommendations. I find myself eating what's in season in North America, and avoiding out of season veggies grown on the ground or below ground.
Maybe things will get better over time. All it will take is one epidemic from mexican grown produce and American consumers will begin to take note. Plus, the farms in Mexico will have to shape up, or lose American customers.
Michael