The Miami New Times has its "details" (pun) here. Sounds a bit like supermarket or tabloid journalism -- "The Gio Gonzalez Files". The "Active Patients" insert appears to be an embedded PDF or image. Set your popup blocker if you look at this paper.
The more mainstream "Miami Herald" reports Gonzalez's denials, here.
My father used to say, we have to worry about what "everyone" thinks, true or not.
The Armstrong matter is also discussed here Jan. 28.
Update: Feb. 19, 2013
Station WJLA in Washington reports that Gio Gonzalez has been cleared of using any banned substances.