UVALDE, Tex. — Pedro “Pete” Arredondo sat before the Uvalde school board last year and let members know what the school system police force needed to be ready to face an active shooter. The pandemic had cut into trainings for his six-member department, the chief said, and while officers had completed a program the previous summer, they needed more — as many as possible. “It’s just like golf, if you play once a year, in six months you’re just not all that great,” Arredondo said, according to a video posted on YouTube of the March 2021 meeting. He stressed that...