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Mexican nationals selling their blood previously entered the U.S. on what are known as B-1 or B-2 visas, documents that allow visitors to shop, do business or visit tourist sites.

A year after the U.S. barred Mexicans from crossing the border to sell their blood, pharmaceutical companies have acknowledged that those donations provided as much as 10% of the plasma collected nationwide as they seek to have the ban overturned. Read more»