Now Playing: Testing the protection of bulletproof backpacks
Now Playing: This student invented a bulletproof wall to protect from school shootings
Now Playing: Retracing missing Tenn. teen, former teacher’s steps after they disappeared
Now Playing: Man uses toddler to steal from claw machine: Police
Now Playing: Georgia school bus driver allegedly forced white students to stand on a moving bus
Now Playing: A brother and sister, separated their entire lives, reunite at last
Now Playing: Suspect arrested in alleged deadlly stabbing of jogger in Washington, DC
Now Playing: Deadly shooting at Maryland Rite Aid facility
Now Playing: Student pilot charged with attempt to steal plane
Now Playing: Shooting near LA school wounds student, employee
Now Playing: Amazon unveils smart microwave and new FireTV Recast
Now Playing: Lion bites late-night zoo intruder trying to breach enclosure over 19-foot fence
Now Playing: Multiple people shot at distribution center in Maryland
Now Playing: Are bulletproof doors the future of school safety?
Now Playing: Woman shot with paintball gun while riding bike
Now Playing: Puerto Rico observes day of mourning on anniversary of Maria
Now Playing: Search and rescue operations continue in the Carolinas
Now Playing: Bodycam video released 3 years after officer fatally shot man who’d passed out in car
Now Playing: Michael Cohen reviewer put in charge of NY church sex abuse cases
Now Playing: Man tries to sneak on plane in the middle of night
Read More