Based on documents supplied by Edward Snowden, it's reported that the National Security Agency is capable of recording 100% of an entire foreign nation's telephone calls, and listening to them as long as a month after they've taken place. MYSTIC was begun in 2009 and reached full capacity against a target nation in 2011. That's according to yesterday's Washington Post, which broke the story. The paper's withholding details as to which countries have been involved at the request of US officials. Co-writer Ashkan Soltani is an independent researcher and consultant.
KCRW
