It’s a court document signed by the Assistant U.S. Attorney representing the Government:

The document can be read in its entirety here.

As I noted in a more detailed post below, the Government sought to bury this admission by omitting it from their press release, and attempting to avoid reading it aloud in court when setting forth the factual basis. I have updated that post to note that I have now obtained the filed version of the document, with the signature of the Government’s representative. Now I think it’s time to start asking the U.S. Attorney’s Office why they tried to hide this language from the public. It’s also time to ask Big Media why they aren’t reporting on this.