At least 28 senior-level federal employees in eight agencies have bogus college degrees, including three managers at the office that oversees nuclear weapons safety, congressional investigators have found.The problem is likely even bigger, mainly because the government has no uniform way to check whether employees' alma maters are diploma mills that require little, if any, academic work, the General Accounting Office reported. The names of the 28 senior-level workers have been forwarded to the offices of the inspectors general in their agencies for review. -- ASSOCIATED PRESS