Some of the revelations attributed to Snowden may not in fact have come from him but from another leaker spilling secrets under Snowden’s name. Snowden himself adamantly refuses to address this possibility on the record. But independent of my visit to Snowden, I was given unrestricted access to his cache of documents in various locations. And going through this archive using a sophisticated digital search tool, I could not find some of the documents that have made their way into public view, leading me to conclude that there must be a second leaker somewhere. I’m not alone in reaching that conclusion. Both Greenwald and security expert Bruce Schneier—who have had extensive access to the cache—have publicly stated that they believe another whistle-blower is releasing secret documents to the media.

I’ve heard this, but wasn’t aware that they both feel that this »