When schools become war zones and both sides start taking casualties, what then?

After surviving a stabbing by a student, teacher Trevor Garfield moves from New York to Los Angeles. There, he resumes teaching as a substitute teacher. The education system, where violent bullies control the classrooms and the administration is afraid of lawsuits, slowly drives Garfield mad. He then moves to California to be a sub for a predominantly Native Hispanic/Latin-American high school in Los Angeles. He is tormented by members of a Native Hispanic/Latino-American tag crew named K.O.S. (Kappin’ off Suckaz).