Clandestine foreign signals intelligence is their charter indeed. But looking at the means they use in regards to their stated charter can give us hints as to h

Clandestine foreign signals intelligence is their charter indeed. But looking at the means they use in regards to their stated charter can give us hints as to how they operate domestically. http://thehill.com/blogs/blog-briefing-room/news/305047-dem-rep-lawmakers-learned-significantly-more-about-surveillance-programs-in-nsa-briefing http://thehill.com/blogs/blog-briefing-room/news/305047-dem-... So if PRISM is just the tip of the iceberg, what method do you suggest for speculating as to what exactly they are doing domestically? Maybe, say, look what they are doing overseas?