Reminds me of the case of Russia discovering imported Norwegian salmon had toxic levels of a certain heavy metal.
Turns out the Chinese bought fish feed was contaminated and the Norwegians had just never tested it.
Discussion
Seeeee? Farmed fish blows might as well eat steak
“Unfortunately, it was not over. In the first week of October 2005, Norway sent another WTO emergency notification for elevated cadmium levels in beef and sheep products.12 This notice again linked the source of contamination to the import of cadmium contaminated zinc sulphate that was used in animal and fish feed earlier in the year”
From the article I linked below
Got a link to this story kinda curious now
https://environmentalchemistry.com/yogi/environmental/200605norwegiansalmon.html
Contaminated with cadmium. Good read
Thank you sir