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Authorities evacuated hundreds of students in an orderly procession - a demonstration of aggressive security measures developed by police and schools following the chaotic 1999 shooting at Columbine, some 8 miles west of Arapahoe High. After that tragedy, police across the country developed "active shooter" training in which responding officers rush toward gunfire - and step over bodies and bleeding victims if necessary - to stop the gunman.

According to a 2010 report from a New York State Task Force, incidents of police-on-police shootings occurred 26 times between 1981 and 2009. Even with a recent line-of-duty death in San Francisco in late January, such accidental violence remains thankfully rare. Law enforcement agencies provide training to prevent these deadly events, but human error and unusual circumstances can still lead to tragedy.

In the year following the Newtown tragedy, police have reassessed the way they'd respond to a similar incident, and a number of departments are learning how to better work with people who have mental health issues or are in crisis.

Gary Sommers has over 40 years service in law enforcement first with the Prince George's Police Department and now with the Montgomery County Police Department both of which are in Maryland. It was while he was working on the Prince George's County SWAT Team in 1988 that Gary was involved in a Blue on Blue shooting that resulted in the death of his best friend and partner, Sgt. Mark Murphy.