21.   Schwoegler said lab officials have responded to the violations by launching an intensive training program for employees.

22.   Some senior lab officials were concerned that the tests of suspected bomb materials were too inexact.

23.   That worries lab officials, who say U.S. nuclear bombs may deteriorate over time and must be tested to ensure they still work.

24.   There was disagreement within the government Monday over how quickly lab officials had notified the Energy Department and the FBI about the disappearance of the hard drives.

25.   While uncovering many problems with the thesis, the teams were unable to lay it to rest, lab officials say.

26.   Panels of lab officials and nuclear experts made the recommendation.

27.   A lab official who spoke on condition of anonymity said Heckenkamp had no access to sensitive or privileged information.

28.   Before becoming an employee at Los Alamos, Heckenkamp was a student at the University of Wisconsin, the lab official said.

29.   De Merode said he had spoken with lab officials about the suspicious sample.

30.   Gustafson said lab officials are monitoring air emissions for radioactivity.