Ran into this article from February 25, 1999 at Salon Magazine:
Dumping scandal: The export of bad blood
A group of Canadian hemophiliacs who say they contracted hepatitis C and HIV from contaminated blood plasma originating in Arkansas and Louisiana prisons during the 1980s journeyed to Washington Wednesday to demand a criminal investigation by the United States Department of Justice into the scandal. Department officials did not immediately respond. The Canadians are asking why certain American prison systems, including one in Grady, Ark., during then-Gov. Bill Clinton’s tenure, continued to export plasma long after the sale of such products had ceased inside the U.S. itself.
Much more at the site. The prisoners sold their whole blood for $7/unit and Arkansas state sold it to Canada for $50/unit. No testing. Because of the no testing, they were not allowed to sell the blood in the USA.