Someone questioned me about this subject about 2 years ago.
IDK. Guess they would first have to find out about us all; then how much does each of us do, because some of our enterprises are more obvious than others.
Most of my customers can barely speak English anyway, so I can't see them telling anything on me....half of them would be afraid of someone would ask for a greencard.
They can try whatever they want, but they got their work cut out for them. Thats a pretty big picture. I mean what they gonna do; get the local cops to go door to door, looking for gardens and small farm animals?
They can tell me not to barter, but how they gonna stop me? People want chicken meat, eggs and honey and I want venison, shrimp, pork and other goods. As far reporting money....sounds like a business to me and I can probably come up with lots of receipts and show a loss.
Honestly, you would think they have enough trouble with things already out of control in several different directions.
You know, like raw milk?
Chuck E. Cheese is goin to the slammer!!!! 
As long as the buyer / trader comes to the farm where the animals are kept we don't have to report to the state.
