A federal probe of Fannie Mae’s accounting policies could shed light on questions about the way it classifies certain assets, although the GSE maintains it has dully disclosed all relevant information to the Securities and Exchange Commission. In a letter sent late last month to Fannie Mae Chairman and CEO Franklin Raines, OFHEO Director Armando Falcon asked the GSE to hand over materials needed for a special examination of Fannie’s financials. Falcon directed the