Violent Intruders: Readiness Must Extend Beyond Active Shooter Readiness Thought Leadership by Michael C. Kimball of M.C. Kimball and Associates, Inc. Most people think of someone with a gun when they hear “active shooter.” But the real threat is wider. A violent intruder can use any weapon at hand to harm others. Recent events show that schools, workplaces, entertainment venues, and public spaces need to be ready for attacks involving knives, blunt trauma instruments like