This is one of the reasons China is going particularly ballistic over Xinjiang cotton. In the past supply chain controversies could be "fixed" relatively easy with bogus local inspections, fake documentation, or supplier shell games, but the science here is harder to fool.
This not just an issue for cotton. As the article notes, fake fish can be spotted with genetic analysis, and that's a global problem with very local consequences. The Boston Globe did a big report on this a few years back, concluding many local restaurants and markets in Eastern Massachusetts were flat-out lying about the fish they were selling:
Ken’s Steak House in Framingham again served Pacific cod instead of a more expensive Atlantic species. Slices of fish sold as white tuna at Sea To You Sushi in Brookline were again actually escolar, an oily species nicknamed the “ex-lax’’ fish by some in the industry because it can cause digestion problems. H Mart, an Asian supermarket chain found to have sold mislabeled red snapper last year, this time was selling inexpensive freshwater Nile perch as pricier ocean grouper at its Burlington store.
https://www3.bostonglobe.com/business/specials/fish/?arc404=...