I don't know. If any of my emails have been searched by the government, then yes, but there's no way of knowing.
That's the problem. Four three years we've been hearing about people's rights being violated, WITH NO EVIDENCE. If (when) we get hit again, I suspect you'll be screaming about another "failure to connect the dots". We can't have it both ways.
You don't have to personally have your privacy invaded to know that you don't want, nor should government have, that power.