With the kind of low-tech feel of farmers' markets, I found it hard to believe that all vendors will be scrupulous. I wonder what kind of "record-keeping" provisions are part of the token exchange system; not much more than a scribble in a spiral notebook, I'd wager.
It will only take the "weakest link" - a vendor that exchanges cash, not cucumbers for tokens - for the system to go awry. All of a sudden, the line of customers at that crooked vendor will include more than suburban moms with kids in tow.
In its rush to promote local foods, the USDA must pause to consider how to prevent the opportunity for fraud and abuse of taxpayer money. We won't tolerate being disillusioned with yet another great American institution.