It sounds like the girl was asked to leave the room; she refused. The teacher did the correct thing calling security. Security came and asked the lovely young lady to leave the room. She refused. Some witnesses said she punched the officer. He did what he had to do after being assaulted and having to get a student who was defiant and responsive out of the room. If they didn't get that girl out of the room, the teacher and the security guard would've been legally responsible for any injuries to other students.
That student lost all her rights when she refused to leave the room. The FIRST priority of the grownups in charge is to protect the safety of the other students. If not, they could justifiably be sued if another student is injured.
I'm sick of this "Black Lives Matter" BS. It's killing a lot of blacks and destroying their communities and schools. JMHO
“That student lost all her rights when she refused to leave the room.”
This is the USA! There is not a damn thing a citizen can do that makes them “lose all rights”.