I think there is a lot of misinformation being shared here.
One does not need a permit to ship plants domestically.
All packages entering a state are not inspected. In fact, in most states, a label indicating that there are live plants inside the package does not cause it to be.
I applaud those states that do, as they are trying to protect their agricultural base.
Lastly, while insect do not honor border limitations, natural barriers like deserts, rivers, oceans, and mountains are pretty good at isolating places, so damaging critters pretty much have to be "manually" introduced.
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