I haven't read all of the posts in here yet so I apologize if this was already covered but it's clear after ep 2 that the cops have definitely been given direction because they shot the homeless guy and that goth looking walker girl in the head (through their eyes). Maybe the homeless guy was a walker too.
I would have loved for the show to show us scenes of the authorities learning about and discussing the "virus". Ugh, so many missed opportunities or maybe they assumed that too many red tape scenes with no zombie activity would bore the viewers. Whatever, I am still enjoying the show.