1.  Although he pleaded guilty to one count related to downloading and copying nuclear data from Los Alamos, other charges were dropped.

2.  Although the indictment accused him of mishandling nuclear data, the charges did not accuse Lee of spying or of any espionage offenses related to a foreign government.

3.  At the heart of the issue is the significance of the trove of nuclear data that Lee is accused of downloading.

4.  After Lee was fired, investigators found evidence that he had transferred vast amounts of secret nuclear data from the classified system at Los Alamos into an unclassified system.

5.  But it also found that China obtained some sensitive nuclear data from nonsecret sources, including academic exchanges and inadvertent leaks of information by scientists.

6.  Habiger has to weigh whether the risks of exposing additional classified nuclear data outweigh the need for the prosecution of the scientist, Wen Ho Lee.

7.  Last year, Los Alamos came under scrutiny following evidence that China may have stolen nuclear data from the lab.

8.  Lee was a scientist at Los Alamos who was investigated in connection with allegations that China had stolen nuclear data.

9.  Lee was a scientist there who was investigated amid allegations that China had stolen nuclear data.

10.  The FBI has reopened the investigation to take a broader look at ways in which the nuclear data could have reached the Chinese.