If the technology was originally developed in Italy, then he's not "exporting" technology, only hardware which he could just as easily construct there.Rossi claimed that he had a factory in Florida where E-Cat parts were being manufactured. It turned out that this "factory" was a 5th floor apartment.For the US government to convict him, though, they would need to prove beyond a reasonable doubt to a jury in open court that a nuclear reaction was occurring, now wouldn't they?
If existing physics is right, then Rossi's device must be putting out massive amounts of gamma rays, and shouldn't be allowed to be distributed without the appropriate safeguards.
If Rossi is transmuting Nickel into other elements by (as he himself said) an unknown process, he probably shouldn't be allowed to distribute his device until we understand the possible effects of this "unknown nuclear process".
If Rossi is a con man, then we presumably don't have to worry about the safety of the device. Our only concern is whether he is defrauding anyone in the process of selling his E-Cats.
I haven't seen any evidence so far that Rossi has made any effort to certify the safety of his device. Like everything else about this, we have to rely on Rossi's unsubstantiated word that it works and that it's safe.
We already know that he is a con man .... convicted five times.