So your solution is let the kid continue to disobey not only the teacher and law enforcement while other kids are in the room so they can see they can do the same. The student wasn't getting up and wasn't giving up the phone. What would you do? I would have drug her out by her chair probably and I do agree the cop took it too far but whats the best route here then....
I'll return volley that question with a twist. What is your solution that doesn't escalate the situation?
my solution is to remove everyone else in that room creating a vacuum for this student. For those that love the forceful option, another way to handle this is for the school request she leaves the property, and if she doesn't the school reports her as trespassing, giving the cop his need of force and handcuffs he wants. Contempt of cop isn't permission for the use of force seen here.