Lockdowns Common in D.C.-Area School Districts

Washington, D.C.-area public schools ordered at least 30 lockdowns since 2014, according to a review of security records by the News4 I-Team.

A lockdown, a security measure often used when police report weapons or threats near school buildings, requires students to be secured inside classrooms and an elaborate regimen for principals and administrators...

http://www.nbcwashington.com/investigations/Lockdowns-Common-in-DC-Area-School-Districts-377054501.html