Four years of intensive U.S.-led efforts to starve terrorist groups of funds have brought home the harsh truth that banks are virtually powerless to spot terrorists solely on the basis of their financial dealings, bankers, regulators and experts say. While more stringent checks, introduced after the September 11 attacks in 2001, have made it harder for groups like al Qaeda to move money around, the chances of uncovering a cell through suspicious transactions alone are seen as next to nothing. Full Story