1) harvesters are required to get permits for harvesting on public lands i.e. National Forests, if allowed in the state. No permit is need to harvest for personal consumption, or to sell to a dealer.
2)If you harvest and want to sell across state lines, you would need a dealer license, or you can sell to an out of state buyer who is also licensed to buy in your state. So to be licensed in a state you do not have to be a resident of that state. But you would need to have the roots certified in the state they were harvested before transporting across state lines. It is unclear wether the roots would need to be certified once they reached the destination state as well.
3) To export out of the country you need an exporters license as well as a dealers license I believe. I think exporters licenses are regulated by the USDA?? which is complient to CITES regulations. CITES is not an agency, it is a treaty ratified by 130 + countries, filled with management protocols that the U.S. has to comply with.
That is the best explanation I can give. #3 is the trickiest. It is very confusing and roundabout. Many dealers have a hard time navigating all the red tape.