Probably sources that have a political bone to pick with no evidence should be banned.<p>Should the NYT report that a UFO passed over because some official told them so? No.<p>When you receive an anonymous tip, its your job as a journalist to try and confirm it, not report it directly.<p>Additionally, when a paper reports something with no evidence and screws up, they usually publish a retraction, not change the article and direct you to a new copy.