1) If you go to the
American Wagyu Association website (
wagyu.org), you find that Wagyu in USA are cross-bred between Wagyu and Angus.
2) Unless I see a Country Source Label, or the official Gold Certificate of Authenticity, I would not trust Wagyu in USA to be true Wagyu.
3)
I will not say the claim of 100% Japanese Wagyu is true or not, as it always possible.
4) I can only go by other sources and reports.
NOTE1: There are DNA tests to prove the true source of the beef.
NOTE2: Per FORBES,
"...You cannot buy Japanese Kobe beef in this country. Not in stores, not by mail, and certainly not in restaurants. No matter how much you have spent, how fancy a steakhouse you went to ..."
"...Under Japanese law, Kobe beef can only came from Hyogo prefecture (of which Kobe is the capital city), where no slaughterhouses were approved for export by the USDA..."
"...It must be processed in a Hyogo slaughterhouse - none of which export to the US - and then pass a strict government grading exam..."
"...the US does not recognize Japan’s trademarks and so the term Kobe beef has almost no legal standing in the US; thus, retailers and restaurants can use the term with impunity..."