How do you know that locally grown food is organic unless someone checks? Local grown and sold food doesn't necessarily mean "organic" it just means locally grown. Pesticides and chemicals are available for local growers too.
Unless you grow it or personally know where, who and how they grow the food you will not know what are you getting.
A lot of "farmers" I know (not in this country but in a country with a non-functioning FDA or USDA) have 2 lots. One lot to grow the food to sell and one to grow for themselves. The pesticide the shit out of one they sell. Nobody checks. Still looks good and pretty and people buy it and sellers make money.