In the wake of Wednesday’s mass shooting at a Florida high school, would you know what to do if you were in a similar situation? Inside Edition went to one New Jersey high school as they prepared for the nightmare they pray will never happen. It's called a code red and that means there is an active shooter in the building and they need to get into lockdown. It's intended to be as realistic as possible, with cops and students covered in fake blood. The drill even included a car bomb.