according to the new york times, apparently the age of civilian video recording makes it sometimes possible to
prove a negative. (in this case, alternately both "no, your honor, i wasn't resisting arrest, and furthermore this officer wasn't even there" and "no, we weren't beating any protestors, in fact the officers were all very polite.")
a few techno-pundits have come out in favor of embracing the panopticon age, so long as everybody gets to be behind the camera too. this is the first real support of that position i've seen.