There is little doubt in my mind that if a zombie attack happened, the public would be the last to know about it. I am sure that the powers that be have vested interest not to incite panic,even if it's warranted. No people, the only way to reveal a true attack is to look at the telltale signs. look for attacks that involve more then one person. also look for lines in the news about head trauma. there might also be hints to mutilation, or cannibalism. so brows the news and post any thing that raises the hairs on the back of your neck.
The gov't isn't some obscure thing, it's people. They are going to look out for themselves first, so when congress unanimously takes an unexplained, sudden, extended vacation, run to the hills.