How Reporting Affects Sources

I just had a question about how your reporting affects sourcing because when you're reporting on the NSA in particular, what kind of intelligence for that matter. I mean, these are really the most secretive corners of a government. They don't like anything out there on them. And so I'm just wondering if, you know, given the fact that your books, you have a very, a common theme in your books done in different ways is betrayal by the government.