Salsalady and Luckydog have been very helpful with respect to value added / food production laws. I am thinking I am one of the few general produce growers / sellers here so I will field this.
Interstate / Federal Laws - There are federal regulations under the Food Safety Modernization Act, but the exemptions are huge. Those exemptions hinge on if you are selling most of your produce locally and some dollar amount I can only dream of hitting. Additional federal laws tend to default to state laws.
State Laws - Ask at your county extension office. If mine does not know the answer, they find the person who does. In Kentucky, some of the rules for selling produce change by county. Usually the rules are fairly easy to follow for produce.
BTW: Carrots do not ship well. Selling them locally, we gotta keep them cool after they leave the ground or they turn to rubber.
Sirex, I agree for produce. At the moment, government doesn't seem to care much. But if not for the exemption that almost didnt make it, they would. In Indiana, just across the river, they raided an Amish milk wagon in a church parking lot with guns drawn. He had crossed the river with unpasteurized milk. In some states, new seed laws are busting the seed libraries because they want each individual, not the library, to be a registered seedman. Now chicken and eggs are the latest thing to enforce. Here in KY, it is now illegal to have a chicken swap meet. You can buy off an individual farm, but putting individual farms in a single place is a major no no.