“I AM a math teacher at Brockton High School, the site of a school shooting earlier this month.Current school security procedures lock down school populations in the event of armed assault. Some advocate abandoning this practice as it holds everyone in place, allowing a shooter easily to find victims.An alternative to lockdown is immediate exodus via announcement. Although this removes potential hostages and makes it nearly impossible for the shooter to acquire preselected targets, it unfairly rewards resourceful children who move to safety off-site more shrewdly and efficiently than others.Schools should level playing fields, not intrinsically reward those more resourceful…..s a progressive, I would sooner lay my child to rest than succumb to the belief that the use of a gun for self-defense is somehow not in itself a gun crime.” (12/28/09)