The Power Hour occassionally has this disclaimer that some of their information may be untrue since it comes from the Government, and the Government has explicitly stated that it lies sometimes.
This disclaimer came to mind when I read the beginning of philosopher Diana Hsieh's article "Excuses Excuses" at http://www.dianahsieh.com/papers/ee.html : To advocate dishonesty or deception as occasionally morally acceptable or even praiseworthy is a tricky business for both philosophers and laypersons. Since successful lies depend upon a presumption of truthfulness, it seems imprudent to announce the possibility of lies and deception in advance. Why on earth did the Gov. announce that, for "national security" or whatever reason, they will lie sometimes ? This makes their own lies ineffective. Truely, the inmates are now running the asylum !