Even as Friday's shooting at Sandy Hook Elementary in Newtown, Conn., suggests that more could be done, the whole culture of school security has undergone a revolution since the 1999 Columbine school shooting, experts say.
"Schools are far more secure than they were at the time of Columbine," says Paul Timm, president of RETA Security Inc., a school security consultancy.
For one, he says, "They keep most exterior doors secured, which is something they didn't pay much attention to before."
As the Syrian opposition gains control of large swaths of territory in the country's north, local councils are emerging as the first alternative authority after 21 months of revolt.
It is still unclear if the civilian councils can impose order in war-torn areas where rebels have the power of arms. And at least parts of major cities remain in the hands of President Bashar Assad's forces.