Here's a fairly amazing video of two police officers behaving in ways that suggest they didn't know they were being filmed. The The Washington Post describes the incident this way:
"The video begins with the man in the chair, two officers alongside. A few seconds later, all three have pitched forward and are prone. Still later, the officers are standing while the man remains on the ground, with off-camera voices appearing to express dismay."
Metro issued a statement Sunday saying that the man, whom police have not identified, had resisted arrest, "which resulted in him falling out of his wheelchair."
This is one way of looking at what happened. Another is that the police picked up a guy out of his wheelchair and threw him to the ground, on which he cracked-open his head. Jason Linkins takes apart the Post story here. Anyway, decide for yourself if this sort of behavior is warranted or not: