In US schools, students participate in longstanding rituals of homecoming parades, basketball practice, and morning announcements. But unfolding alongside these scenes are a set of newer traditions: lockdown drills, teacher firearms training, metal detector screenings, and school safety trade shows.

The high school film is chillingly updated in this panoramic account of the measures needed to tackle active shooters on campus. Examining the impact on students while surveying the parasitic industries that capitalise on their fears, Bulletproof is an alarming indictment of the new American normal.