In California certified farmers markets are not allowed to re-sell produce. Not sure if it's enforced. And it's hard to look up non-existing laws in other stat

In California certified farmers markets are not allowed to re-sell produce. Not sure if it's enforced. And it's hard to look up non-existing laws in other states. When I don't find something I assume I'm not searching correctly, but in this case there might just not be a law to find.