The U.S. Treasury Department Tuesday prescribed new compliance rules on the prepaid product industry, a sector largely unregulated despite concerns about its vulnerability to money launderers. By September, providers and sellers of stored value products must implement know-your-customer programs and file suspicious activity reports on certain questionable transactions related to the purchase of the cards, according to the 69-page rule issued by the department's Financial Crimes Enforcement Network (FinCEN). Under the regulations, prepaid access companies must contractually determine which businesses in the transaction chain will assume primary anti-money laundering (AML) responsibilities and answer to the Internal Revenue Service-an issue left...