[IncPen]

2) Inside the paddy wagon, the perp starts throwing himself around, much like a drunk will sometimes do in a police holding cell. This is when he likely got the head injury from a bolt head on the rear door.

It also seems possible that the cops were accelerating and slamming on the brakes, to toss him around in back and shut him up.

[marktwain]

Prosecutor says there is probable cause for filing charges against police officers:

http://www.freerepublic.com/focus/f-news/3285198/posts