Mark,
The link below gets you to the wildgrown sites bit on TN Ginseng Laws. It will answer some of your questions.
www.wildgrown.com/index.php/Ginseng-Laws...and-Regulations.html
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You don't have to have a license to hunt ginseng in TN, but do have to have land owner permission.
Also - you can't take seng across the State line (like from TN to KY) unless you are a Registered Ginseng Dealer and that cost you 250.00 in TN.
I have not found any State land to hunt on, but I guess there could be some out there.
I have found that if you get to know some landowners and they get to trust you, they will let you hunt on their property. They mostly have to know and trust you though. I have found some land owners that I have talked into letting me hunt on their property by offering to teach them how to find seng, and coach them on how to grow wild simulated.
When I go hunting on someone elses property I always offer to split what I find 50/50 with them. At the end of the hunt I just divide the seng out into two piles and then let them pick which pile they want.
If they actually go with me - even though I may have found 98% of it and helped them find what they did find, I split it with them 50/50.
Good Luck to you !
TNhunter