The word "terrorism" has become commonplace in the headlines, workplaces, and homes since September 11, 2001. In the past, school crisis plans commonly addressed how to evacuate in the event of a gas leak or fire. Today, schools must be prepared to address biological, chemical, and radiological attacks, as well as car bombings, suicide attacks, and armed intruders. In this article, the authors explore the practical and legal requirements of school safety planning in this post-September 11 era.