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					Interior Windows: Overview and Common Vulnerabilities
                                                  There are two primary security considerations in regards to
                                                  interior windows, in particular those that provide lines of
                                                  sight into/out of classrooms and other populated areas such
                                                  as windows built into or adjoining classroom doors.92 The first
                                                  is allowing for natural surveillance of hallways and immediate
                                                  areas surrounding classrooms and other areas, which may be
                                                  important in allowing those inside of a classroom to recognize
                                                  or appraise a danger outside of the classroom and take
                                                  appropriate response measures. It is also important for those
                                                  inside of the classroom to be able to see who is at the door
                                                  before allowing an individual entry to the classroom. The
                                                  second consideration, and one with particular relevance to an
                                                  active shooter situation, is minimizing a window’s
                                                  vulnerability during response procedures such as a lockdown.
                                                  Such windows must prevent or greatly hamper an assailant’s
  Figure 22: Example of non-ballistic resistant   ability to bypass a locked-down door by either gaining direct
glass near and in door, creating vulnerability to access though broken glass or using a breach in the window to
                   assailants.                    unlock the door from the inside. (see Figure 22)

Previous incidents serve to emphasize the importance of this factor. For example, in 2010 a 16-year-old
attacker killed six people hiding in a locked classroom in Hastings Middle School in Minnesota by
shooting and subsequently stepping through a tempered glass window that ran vertically alongside the
classroom door.93

Interior Windows: Best Practices
There are several best practices with regards to interior windows that can minimize the ability of an
assailant or unauthorized individual to gain access to interior areas such as classrooms. These relate to
the size, placement, and material used for windows, and include the following:

          Minimize the size of windows or install multiple smaller windows interspersed by barriers so as
           to prevent providing adequate space for entry by assailant;
          Place windows at sufficient distance from interior locking mechanism to prevent or make
           difficult opening a door or lock from inside;
          As a cost-effective measure, consider concealing or obscuring window views during events such
           as a lockdown to prevent assailant from ascertaining status or presence of persons inside of
           classroom;
          Consider steel-plating (hardening) window frames to lessen window vulnerability;
          If feasible and if resources permit, consider installing ballistic-resistant windows for interior
           spaces such as classrooms.




92
     See FLDOE, p. 40
93
     Huppert


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