Guides
How these bodies of regulation actually work: where federal law stops, why states diverge, and what a seller has to do about it. These explain the shape of the problem. They don't list what any particular jurisdiction's rule is, because the rule library isn't published.
How US kratom regulation actually works
No federal kratom statute exists, so authority sits with the states, and they have diverged into three very different postures.
What multi-state shipping compliance actually requires
Destination-based rules, silent failure modes, and why a spreadsheet of state restrictions stops being true the moment you save it.
Why the 2018 Farm Bill didn't settle hemp shipping
Federal law legalized hemp and expressly left states free to restrict it. That gap is why delta-8 and hemp edibles are still hard to ship.