And what country are you from? Police [are supposed to] have this thing called Probable Cause. Riding with a person who fails to signal a turn is not probable cause for electric shock therapy.
One thing that absolutely blows me away is that cops - especially those of the federal variety - have looser rules of engagement than soldiers in combat. Trust me, a soldier who had done to a detained combatant what those cops did to an American citizen would face a court martial. Doubt me? Do just a little bit of research. Hint: Lon Horiuchi...
The country I am from is the one where resisting arrest is a crime punishable by imprisonment.