These white boards are a knee jerk reaction to the Sandy Hook Elementary School shooting.  They will provide a false sense of security but I am afraid would be ineffective in the event of an actual shooting.  A shield is defensive and would not eliminate an actual threat.  We need to concentrate on prevention and real protection.  These school shooters all appeared to have obvious mental illnesses and yet somehow went unreported.  Individuals with mental illnesses are the problem, not the guns.  Schools should allow teachers and staff who are willing take appropriate training to carry concealed firearms.  In Florida we have had resource officers in middle and high schools, and since the Newtown shooting they have also put them in elementary schools.  We must be proactive, not reactive, when it comes to violence in our communities. This is a good lesson for children, too, to understand how we can be prepared to deal with violence without fear.