Interesting analysis of printer microdots.
Not sure that I agree that this is a 3rd Amendment violation, though. Remember, it's really hard to hide your data transmissions from the NSA. If you're using their hardware, I'd imagine that it's as close as you're likely to get to functionally impossible.
UPDATE 6 June 2017 14:15: It appears that the leaker was exceptionally dim, not only printing the document from her NSA computer but emailing the Intercept using her personal Gmail account from the same computer.
But it's early, and the story is evolving. This make be "fake news".