Think of it this way, in states like Ohio you can't shoot someone you catch in your house stealing your TV if he (or she) is walking out the door with it. Breaking in the first time might be different if your state has the Castle Doctrine in effect. Catching them in your ginseng patch is really the same thing. You just can't (and shouldn't want to in reality) shoot someone over property. Self-defense is a completely different story.
Trail cameras are good. Very small concealed cameras are better. Cameras placed to catch movement of deer or people are good. Placing them so high you need a 24 foot extension ladder is better...and hiding them in stuff around on the ground is often better yet.
Remember, I'm not an attorney...just a cop who grows ginseng.