Hampered by restricted access to international wire data, U.S. federal officials are hoping to shine a light on a suspected money-laundering ring through reports on cash payments in Miami's electronics sector. In April, the U.S. Treasury Department placed roughly 700 electronics exporters and retail outlets located near Miami International Airport under a Geographic Targeting Order (GTO) that requires the businesses to report on customers that pay with more than $3,000 in cash. The department's Financial Crimes Enforcement Network (FinCEN) said in a statement issued with the GTO that Mexican cartel associates are using illicit proceeds to buy cell phones and other...