@jlperuyero Do the UPC barcodes use the same GS1 country prefixes?

At what point is the country code determined? This may not be an exhaustive way of checking country of origin. Per the GS1 standards page for country codes "Since GS1 user companies can manufacture products anywhere in the world, GS1 Prefixes do not identify the country of origin for a given product."
So I wonder, if this might come with opportunities for false negatives or false positives through legal-bureaucratic supply chain nonsense. I couldn't find solid clarification anywhere online about this from a brief look.