88 percent of schools have shooter plan.

help, and making sure all students know it’s their responsibilit y to help keep their school safe.

“We do have cameras, but I truly believe that students are doing the right thing because they feel safe on campus, rather than they are doing the right thing because there may be cameras,” Ellspermann said.

Even before the Newtown killings, schools had been working more closely with local law enforcement and ramping up other school security measures, said Ronald Stephens, executive director of the National School Safet y Center.

“I think something like Sandy Hook certainly punctuates the need to engage additional securit y strategies, but I re- ally see it as an ongoing trend,” he said.

Stephens said he believes the work has been a factor in a decrease in overall school crime.

The survey showed 65 percent of public schools reporting one violent incident in school, such as a rape, fight, robbery or threat of physical attack. That’s down from 74 percent in the 2009-10 school year.

The findings were based on a survey sent to school principals. Among the other results:

■ About 8 in 10 schools reported having a parent notification system that automatically notifies parents in case of an emergency, compared with about 6 in 10 schools four years earlier.

■ Slightly less than half — 47 percent — of schools reported having a system that allowed someone to report a crime anonymously, compared with 36 percent four years earlier.