The fact remains unless you grow it yourself, you'll never know where it comes from. All the more reason I would prefer my customers to make their purchase at my farm where they can see what their getting (despite bobm's impression of all farms) I'm slowly gaining a customer base that are repeat customers for a reason, I have no desire to S**T anyone out of their hard earned money for any reason, I don't need to, I earn an honest pay check from a full time job, and farm on the side.
You would be surprised at how many times some of my customers are excited that they have found somewhere they can buy the things they don't want to grow. Either because they don't want to work In the garden, or their just lazy, who cares, one fact I have found out in life, if your honest, work hard, and provide a consumer a good quality product at a reasonable cost you will succeed. It may take you longer to earn peoples trust, because of low life's, but eventually you will succeed.