Delta 9 derived from hemp can be mailed across state lines, Delta-9 derived from Marijuana can not. The kind that can is a CBD type , and the other is THC. There is a big difference. One should know what they are buying, so it is good to get small amounts of something to try. Start out with a small dose, increase every 45 minutes until satisfied. If that doesn't work, double the starting dose. If that is unsatisfactory whatever it is , is probably a dud for you.
It is too confusing for me and I have been doing this for a couple years. Now they have made it completely complex the different compounds being mixed
together.