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In America you don't even have to bung your suppliment company any cash although I'm sure it helps. There is no random batch test at the company to check for contamination from a governing body so you can just get a large enough sample yourself from one single batch spike it get your own tester in to verify it and submit that as proof. If the company simply can't explain it or prove the contamination didn't come from their massive unregulated factory which they obviously can't your all good. They've done it with nut allergy warnings so maybe BCAA's should come with labels saying may contain traces of methylated testosterone or simian growth hormone ?
Just doing some googling...
https://www.reuters.com/article/us-doj-investigation-dietarysupplements-idUSKCN0T628320151118
https://www.dietspotlight.com/jack3d-review/
"As of March 2019, USPLabs has ceased operations as part of a plea agreement in a criminal case that included claims of fraud and a possible connection between a distributor and an outbreak of illness in 2013, shares Natural Products Insider."
"an outbreak of illness" = "2013 outbreak of hepatitis that led to hospitalizations, liver transplants and even one death."
https://www.justice.gov/opa/pr/two-individuals-and-two-companies-sentenced-scheme-fraudulently-sell-popular-dietary
https://muscleinsider.com/news/usp-labs-owner-and-his-president-going-jail