Despite push for school safety policies after Texas shooting, research shows they do little

Safety policies designed to protect schools from mass shootings have done little to deter them and may even be harmful to students, research shows, despite a renewed push for such measures in the wake of Tuesday’s shooting in Texas.

The 18-year-old gunman who killed at least 19 children and two teachers at a Uvalde elementary school was able to evade armed police officers and other security protocols already in place. Yet some U.S. lawmakers are arguing those policies are needed, and…