One of the sore points in the NYC school system is the school safety issue. Under Mayor Bill de Blasio's school safety has deteriorated dramatically and continues to do so. Just look at MS 158 in Queens. Of course the statistics don't show it since many incidents go unreported or are quietly handled in house by school administrators who don't want to have the DOE penalize them as a dangerous school/
Under Mayor Bill de Blasio you have less student suspensions, not because there are less incidents but because principals are told not to suspend students for things like student misbehavior, insubordination, and drug use. Instead, school safety officers and Deans are told to give out "warning cards" or refer the student to restorative justice sessions that the students find as a joke.
Another issue is the use of cellphones in school. In some schools the cellphone use was so bad that Principals have decided on their own to collect cellphones at the door, despite parent and student complaints.
Take a look at my four part series on school safety Here