I adore ALL the great vendors at our Elon Farmer's Market. I trust all of them and I think they're just the best thing that has happened to my kitchen since I learned how to chop properly.
(Psst, Farmer's Market today! 3:00-6:00 - Elon Community Church grassy area on Williamson Ave.)
That said, there have been some disturbing reports in the news lately of scams going on at OTHER farmer's markets including last year at our Greensboro market, and last week in a Los Angeles market.
Planet Green has some good tips for making sure that you're getting what you mean to get at the farmer's market.