The oil comes from a process of heating the plant matter to “activate” the weed. Then you “slow cook” in a medium. This medium is usually a coconut or olive oil. The CBD molecules attach to the oil molecules.
That oil can then be used directly, or in cooking.
Alternatively, you can mix the “activated” plant matter with Everclear to create a tincture.
The THC levels in the oil would be dependent on the plant, the activation process, and the type of oil.
Transportation of any pot product across state lines is risky. You must be sure of the rules from one location to the next. 1 Oz in one state is legal. It will get you fined in another.
That’s pretty much what we did. You have to keep the oil temps under 200. It’s a lot of standing around waiting and watching. We used the canning kitchen in the basement because there is quite a smell generated.
My next project is to make CDB oil. That stuff is expensive