It details what to do if a gunman gets into the building, everything from barricading a classroom to running for cover.
The film setting is at a high school in Bergen County.
It's a training video of the worst case scenario.
It was shot over 18 months at New Milford High School pulled together by Bergen County Prosecutor John Molinelli.
"They are trained for an active shooter, so this is a supplement, best to see rather than hear or read," Molinelli said.
Two videos were made. One to help teach law enforcement responding to an active school shooter.
The second is for educators; what to do and what not to do.
For instance, one teacher, after herding her class to safety is lead into a deadly trick.
The other follows threat guidelines.
"Teachers know not to open the door for anyone until they get the all clear, until officers come," Molinelli said.
Prosecutor Molinelli also has a safety expert who visits schools to assess their security and lets them know how to ramp it up.
Calls are pouring in for his services.
The training video will be available to districts next month.
Get Eyewitness News Delivered