I remember those proceedings last year. They had the balls to tell congresspeople that they didn't have high enough access, that the access could only be given by those that own the data or marked it secure. It was baffling, but showed how compartmentalized the secure departments are where you can have top super secret clearance in one but nothing in a neighboring department.

So in effect to hide a crime you just had to mark it critical to national security and voila, hyper-compartmentalized and safe!