Connecticut has been proactive about safety precautions in its schools ever since the Sandy Hook school shooting over a decade ago. One local town is reacting to the lack of safety measures at a school in Nashville that led to a tragedy.

A lone shooter on Monday blew out the windows at a Christian elementary school in Nashville to get inside before killing six people, including three children.

"When a tragedy like this happens, it tears on your heart strings," said Fairfield police school resource officer Edward Kovac.

Fairfield school resource officers say they are constantly working on security to monitor who is coming in and out of their schools. That includes the use of cameras.

"No one should be able to enter a school without authorization, without being checked in, without being buzzed in," said Kovac.

The Fairfield Police Department School Safety Division was started back in 2013 shortly after Sandy Hook. It has resource officers at all of the public and private schools in town.

"We as a school safety unit go to extensive training, learning how to improve the safety and security of the schools. We then bring it back to the school system. We train with the teachers, administrators, all the staff at the schools," said Kovac.

In response to the Nashville school shooting, Fairfield police sent out a letter to parents to reassure them that there is strength in numbers.

"The students that I go to school to protect every day, I think of them as my own kids," said Kovac.

Police say we are all responsible for school safety.

Many schools in the state are now using bulletproof glass to prevent an intruder from shooting out the windows.