In fairness, there is a system like this set up for travel health insurance. The NHS isn't going to cover health care in the US, so a British person traveling here can buy, say, a two-week policy from Lloyd's or whatever, who then will reimburse an American hospital if they get in an accident. I used to buy such policies from Canadian insurers when I traveled abroad, before moving here. I never had to use them, so I don't know how exactly the process works, but somehow they figure out a way to get money from a foreign insurer to an American hospital without the tourist having to hand over thousands of dollars.
But I don't really know what the point of this side-discussion is in this context. If a product is legal in the US, an American company can sell it, and if it isn't, a seller located in a foreign country doesn't make it so. "No, your honor, the cocaine doesn't come from the Wisconsin regulated pharmaceutical market, I bought it direct from Escobar's of Medellin..."