So it's a trust game, then.
For what it's worth, Ive found producers at farmers markets (with few exceptions), to be just as dishonest as big corporations.
Discussion
Did you do testing yourself?
I agree and I don't think you can make blanket statements about who to trust. Gotta just get the vibe from people and see if they are worthwhile in my opinion and that takes time.
Go out and see the farm. If you can't do that, they're hiding something.
I think it would be worth experimenting with a 3rd party testing partner, as you scale fewer people are going to be able to shake your hand.
I've been shifting more and more of my purchases towards companies that do regular 3rd party testing.