EARTHman

"Speech is often provocative and challenging. . . . [But it] is nevertheless protected against censorship or punishment, unless shown likely to produce a clear and present danger of a serious substantive evil that rises far above public inconvenience, annoyance, or unrest."

"a properly trained officer may reasonably be expected to 'exercise a higher degree of restraint' than the average citizen, and thus be less likely to respond belligerently to 'fighting words.'"