From David Brin at Looking Toward the Future:
The most important advance in civil liberties in this century so far, in the U.S. and by extension the western world, was in 2013 when the Obama Administration and then five U.S. district courts ruled that citizens have a powerful right to record the actions of officials – especially police – in public. No interaction with authority is more needful of accountability than at the level of the street. Moreover, a citizenry who are accustomed to that right will apply sousveillance also upward, as I have long held and as I describe in The Transparent Society and in EARTH.
Now the U.S. Eighth District Court in Missouri has declared the exact opposite, allowing cops to seize or break your camera or arrest you, even when you are clearly not interfering.