My guess is that they could be prosecuted if they break U.S laws abroad.
Being a credit card they're actually the ones making the purchase not you.
I know here if a citizen breaks the law of the U.K even if it's abroad and legal in that country they could be prosecuted. So maybe there's something similar happening here.
On a side note, be careful with the ol' ethno botanicals mate. You sound like you are but you need to do your research on them before taking. Some are great, but you get others like Salvia then can really screw you up.
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Cerebus Sticky! Sticky! Stick! Stick!, Mon 17 Oct 2011, 11:51,
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