Therefore, full safe clearance is never done during the day (except in emergency repair situations), and nighttime is the only time all the major maintenance work can be completed.

FORBES: Why Does BART Need To Do Nightly Maintenance?

The report includes that the safe was accessible to more than a half dozen Gonzales staff members who did not have clearance to see such material.

NPR: Report: Ex-AG Gonzales Mishandled Classified Info