Department of Defense, Congressional Staff Forbidden From Reading Publicly Available PRISM Documents
This seems like a ridiculous thing to do, but okay, sure, these documents don't exist.
Thanks to Edward Snowden's leaked documents, everyone in the world can learn a lot about what the NSA was up to with the PRISM data mining program. Except the people who should have been overseeing it in the first place, as it turns out. Both Congressional staffers and Department of Defense employees have been instructed to not look at the documents and basically pretend they were never leaked in the first place.