The New York Times has a long article Trayvon Martin Case Shadowed by Series of Police Missteps by Serge F. Kovaleski. You can smell the CYA positioning all over the article as more evidence emerges and the media's Narrative crumbles.
The first part of the article insinuates that police incompetence must be the explanation for why the prestige press has come up with so little strong evidence against George Zimmerman during the two months of media frenzy. But the rest of the story shows, despite the reporter's and editor's bias, that the cops did, on the whole, a decent job of investigating the case. Certainly, the local law enforcement folks, before politics kicked it upstairs to that comic special prosecutor, have done a far better job than the national media at uncovering the facts and evaluating them in a rational manner.