‘Arm the good guys’? Kentucky and other states weigh adding guns to schools.
Five school shootings so far in 2018 have resulted in serious physical injury or death – including the fatal shooting of 17 students and teachers in Florida.
Read moreWhat happens when cops become hallway monitors
The number of police in schools has skyrocketed in recent decades. But as students head back to school, the big question is: How effective are they?
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