Poor choice of words on my part. The quote from the article I linked to was: "we learned that the government had issued a subpoena."
Poor choice of words on his part, probably stemming out of never being in any controversies and not having learned how specific you have to be when asked that kind of question.
He later called the reporter back and clarified: ""I have never done it. Let me make myself clear: I will never be positive. I don't take anything. I've never tested positive in anything and I never will."
Yeah, I believe that's the case. From what I've read the players were notified in "a memo" from the MLBPA. That implies that they all MLB players got the same memo, which probably just said what the results of the "survey test" were (what percentage of the results were positive) and how that affected upcoming testing.