According to a poll released earlier this month, parents value school resource officers more than anything. In contrast, few believe arming teachers is a viable option.

Three children and three adults were gunned down at a private Christian school in Tennessee on Monday before the shooter, who was described as a young woman, was killed by police.

“I just will never forget the look on his face that he gave me while he pointed the gun directly at me,” first-grade teacher Abby Zwerner said during an exclusive interview with NBC’s Savannah Guthrie about the student. “It’s changed me. It’s changed my life.”

From active shooter emergencies to extreme weather events, the need for advanced school safety technology has never been greater and the stakes have never been higher.