Benjamin Lawsky, New York's financial services superintendent, has opened an investigation into manipulation of the currency markets by large banks and is requesting documents from more than a dozen institutions, according to a source familiar with the matter. The source said Lawsky has asked for documents from Barclays , Credit Suisse, Deutsche Bank, Goldman Sachs, Lloyds Banking Group Plc, RBS , Societe Generale and Standard Chartered. The investigation adds another name to the list of regulators and law enforcement offices around the world looking at whether traders at the largest banks unduly influenced currency ... (full story)