Reply #15: It's

[ProSense]

media driven. From the Steven Aftergood piece linked to in the OP article:

<...>

The NSA Act exemption cited by the government is most commonly used in Freedom of Information Act cases to deny access to unclassified information. It has never been used to exclude information in a criminal case, the defense said. Even if it were permitted to be invoked in this case, it requires a detailed affidavit to support its use in each instance and no such affidavits have been produced.

<...>

So is has been "commonly used" in other cases and the missing element here is a "detailed affidavit"?

It's an unfolding legal case being used by the media to spark outrage. Aftergood's piece isn't even controversial. It's simply a description of the case and brief.