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If they are responsible for getting it imported, they are breaking the law.

They are breaking *US* law from outside the jurisdiction of that law. Unless they have presence/assets in the US why should they care?

USians seem to be unable to deal with the fact that whatever law applies to you doesn't necessarily apply to others. In a way it's understandable because it's such a big country and somewhat homogenised (state-to-state differences, sure, but mostly the same game wherever you go). From here, a 500 mile journey could drop me in countries with completely different cultures, different languages, different currencies and different laws.

So the jammer manufacturer could be well aware that they are breaking US law, and simply not give a toss. Assets in the US could be confiscated and -likewise- US holidays wouldn't be a bright idea for the execs but they would be otherwise untouchable unless the Chinese government intervenes.

An example: It is illegal for Australians to have laser pointers above a certain power. Last time I checked, it's perfectly legal where I am to have any laser pointer I desire; and moreover to post it to whoever I feel like. So I could perfectly legally buy a big box of the most powerful pointers I could find and post them to Australia. I would not be breaking any laws -even Australian ones- because I am not in their jurisdiction and so their law does not apply to me. If I personally took the pointers there, or if I ordered one from within Australia then, yes, I would be breaking the law. Othewise no.