After Texas shooting, schools around the U.S. brought additional security staff

In the aftermath of the elementary school massacre in Uvalde, Texas, schools around the U.S. have brought in additional security staff and restricted visitors as they deal with a new rash of copycat threats.

For some families and educators, it all has added to uneasiness in the wake of the deadliest school shooting since the 2012 attack at Sandy Hook Elementary School.

Jake Green, 34, of Los Alamos, New Mexico, was jolted when he saw a plainclothes police officer for the first time…