Accountability Office Finds Itself Accused

By WILLIAM J. BROAD

A senior Congressional investigator has accused his agency of covering up a scientific fraud among builders of a $26 billion system meant to shield the nation from nuclear attack. The disputed weapon is the centerpiece of the Bush administration's antimissile plan, which is expected to cost more than $250 billion over the next two decades.

The investigator, Subrata Ghoshroy of the Government Accountability Office, led technical analyses of a prototype warhead for the antimissile weapon in an 18-month study, winning awards for his "great care" and "tremendous skill and patience."

Mr. Ghoshroy now says his agency ig