At Pioneer Ridge Middle School on Tuesday, Independence Police Sgt. Chris Summers was swarmed by teacher Cody Carlson (from left), principal Michael Estes and teacher Dave Nowak. Red balls represented objects thrown at the intruder.
At Pioneer Ridge Middle School on Tuesday, Independence Police Sgt. Chris Summers was swarmed by teacher Cody Carlson (from left), principal Michael Estes and teacher Dave Nowak. Red balls represented objects thrown at the intruder. Keith Myers The Kansas City Star
At Pioneer Ridge Middle School on Tuesday, Independence Police Sgt. Chris Summers was swarmed by teacher Cody Carlson (from left), principal Michael Estes and teacher Dave Nowak. Red balls represented objects thrown at the intruder. Keith Myers The Kansas City Star

Controversial workplace lessons demonstrate how to thwart an armed intruder

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