Student survivors of school shootings have made their voices heard, loud and clear. But the teacher's perspective of school shootings is less common. Megan Doney is an English professor turned gun control activist who writes about her traumatic experience. And: Research suggests that a police strategy called "community policing" benefits those with mental illness. Charlotte Gill rides along with a police officer and catches a surprisingly warm encounter.

Later in the show: Hunting for evidence at a crime scene? Try E. coli. Biology professor Amorette Barber and analytical chemist Sarah Porter have invented a way to use bacteria to detect gunshot residue. Porter is a Virginia Outstanding Faculty Award recipient. Plus: One of the biggest misconceptions of school shooters is that they are all mentally ill kids who are evil from birth. Philip Mongan says most of them live normal lives until they experience triggers and turn violent over months or years.

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