It's unclear whether or not that's actually prohibited. It looks like Creekstone...

mannerheim on May 5, 2021 | parent | context | favorite | on: Doctors investigate mystery brain disease in Canad...

It's unclear whether or not that's actually prohibited. It looks like Creekstone was the only beef processor who desired to test for BSE, and this was based on them wanting to export their beef to Japan. The rejection was made on this basis.