Mr. Lee is accused of transferring hundreds of files containing nuclear weapons secrets to unclassified computers and removable computer tapes between 1993 and 1997.

One of the longstanding security concerns about the laboratories has been the possibility of transferring nuclear secrets from classified computer networks into unclassified computers in the labs.

"Well then, why can I reach NSA's computers from my unclassified and obviously insecure computer?"

"Dockmaster is NSA's only unclassified computer," Greg said.

"Livermore has a few unclassified computers, where they research fusion energy."

Eventually I reached the DOE manager of computer security for unclassified computers.

The unclassified computer is used mainly to browse the Internet and send unclassified e-mail.

One proposal is to "make it physically impossible to transfer classified information from a classified computer to an unclassified computer," Los Alamos officials said in a statement today.

That's when they found that he had transferred a huge cache of highly classified nuclear design codes into an unclassified computer.

Mr. Deutch placed the most sensitive documents that he worked on as director on the unclassified computers in his home, the report found.